Английская Википедия:ANSI escape code
Шаблон:Short description Шаблон:Redirect Шаблон:Use dmy dates Шаблон:Infobox character encoding
ANSI escape sequences are a standard for in-band signaling to control cursor location, color, font styling, and other options on video text terminals and terminal emulators. Certain sequences of bytes, most starting with an ASCII escape character and a bracket character, are embedded into text. The terminal interprets these sequences as commands, rather than text to display verbatim.
ANSI sequences were introduced in the 1970s to replace vendor-specific sequences and became widespread in the computer equipment market by the early 1980s. They are used in development, scientific, commercial text-based applications as well as bulletin board systems to offer standardized functionality.
Although hardware text terminals have become increasingly rare in the 21st century, the relevance of the ANSI standard persists because a great majority of terminal emulators and command consoles interpret at least a portion of the ANSI standard.
History
Almost all manufacturers of video terminals added vendor-specific escape sequences to perform operations such as placing the cursor at arbitrary positions on the screen. One example is the VT52 terminal, which allowed the cursor to be placed at an x,y location on the screen by sending the Шаблон:Code character, a Шаблон:Code character, and then two characters representing numerical values equal to the x,y location plus 32 (thus starting at the ASCII space character and avoiding the control characters). The Hazeltine 1500 had a similar feature, invoked using Шаблон:Code, Шаблон:Code and then the X and Y positions separated with a comma. While the two terminals had identical functionality in this regard, different control sequences had to be used to invoke them.
As these sequences were different for different terminals, elaborate libraries such as termcap ("terminal capabilities") and utilities such as tput had to be created so programs could use the same API to work with any terminal. In addition, many of these terminals required sending numbers (such as row and column) as the binary values of the characters; for some programming languages, and for systems that did not use ASCII internally, it was often difficult to turn a number into the correct character.
The ANSI standard attempted to address these problems by making a command set that all terminals would use and requiring all numeric information to be transmitted as ASCII numbers. The first standard in the series was ECMA-48, adopted in 1976.[1] It was a continuation of a series of character coding standards, the first one being ECMA-6 from 1965, a 7-bit standard from which ISO 646 originates. The name "ANSI escape sequence" dates from 1979 when ANSI adopted ANSI X3.64. The ANSI X3L2 committee collaborated with the ECMA committee TC 1 to produce nearly identical standards. These two standards were merged into an international standard, ISO 6429.[1] In 1994, ANSI withdrew its standard in favor of the international standard.
The first popular video terminal to support these sequences was the Digital VT100, introduced in 1978.[2] This model was very successful in the market, which sparked a variety of VT100 clones, among the earliest and most popular of which was the much more affordable Zenith Z-19 in 1979.[3] Others included the Qume QVT-108, Televideo TVI-970, Wyse WY-99GT as well as optional "VT100" or "VT103" or "ANSI" modes with varying degrees of compatibility on many other brands. The popularity of these gradually led to more and more software (especially bulletin board systems and other online services) assuming the escape sequences worked, leading to almost all new terminals and emulator programs supporting them.
In 1981, ANSI X3.64 was adopted for use in the US government by FIPS publication 86. Later, the US government stopped duplicating industry standards, so FIPS pub. 86 was withdrawn.[4]
ECMA-48 has been updated several times and is currently at its 5th edition, from 1991. It is also adopted by ISO and IEC as standard ISO/IEC 6429.[5] A version is adopted as a Japanese Industrial Standard, as JIS X 0211.
Related standards include ITU T.61, the Teletex standard, and the ISO/IEC 8613, the Open Document Architecture standard (mainly ISO/IEC 8613-6 or ITU T.416). The two systems share many escape codes with the ANSI system, with extensions that are not necessarily meaningful to computer terminals. Both systems quickly fell into disuse, but ECMA-48 does mark the extensions used in them as reserved.
Platform support
In the early 1980's, large amounts of software directly used these sequences to update screen displays. This included everything on VMS (which assumed Dec terminals), most software designed to be portable on CP/M home computers, and even lots of Unix software as it was easier to use than the termcap libraries, such as the shell script examples below in this article.
Terminal emulators for communicating with remote machines almost always implement ANSI escape codes. This includes anything written to communicate with bulletin-board systems on home and personal computers. On Unix terminal emulators such as xterm also can communicate with software running on the same machine, and thus software running in X11 under a terminal emulator could assume the ability to write these sequences.
As computers got more powerful even built-in displays started supporting them, allowing software to be portable between CP/M systems. There were attempts to extend the escape sequences to support printers[6] and as a early PDF-like document storage format, the Open Document Architecture.Шаблон:Cn
DOS and Windows
A huge blow to the popularity of the sequences was that the IBM PC, introduced in 1983, did not support them for local programs (this was common for "all in one" home computers, but rare for machines of this complexity). Only a few control characters (BEL, CR, LF, BS) were interpreted by the underlying BIOS, making it almostШаблон:Efn impossible to do any kind of full-screen application. Any display effects had to be done with BIOS calls, which were notoriously slow, or by directly manipulating the IBM PC hardware. This made any interesting software non-portable and led to the need to duplicate details of the display hardware in PC Clones.
DOS 2.0 introduced the ability to add a device driver for the ANSI escape sequences: Шаблон:Mono. Slowness, and the fact that it was not installed by default, made software rarely take advantage of it; instead, applications continued to directly manipulate the hardware to get the text display needed.Шаблон:Citation needed ANSI.SYS and similar drivers continued to work in Windows 9x up to Windows Me, and in NT-derived systems for 16-bit legacy programs executing under the NTVDM.
Many clones of DOS were able to interpret the sequences and do not require a separate ANSI driver to be loaded. PTS-DOS[7][8] as well as Concurrent DOS, Multiuser DOS[9] and REAL/32 have built-in support (plus a number of extensions). OS/2 had an Шаблон:Mono command that enabled the sequences.
The Windows Console did not support ANSI escape sequences, nor did Microsoft provide any method to enable them. Some replacements or additions for the console window such as JP Software's TCC (formerly 4NT), Michael J. Mefford's ANSI.COM, Jason Hood's Шаблон:Mono[10] and Maximus5's ConEmu interpreted ANSI escape sequences printed by programs. A Python package named colorama [11] internally interpretes ANSI escape sequences in text being printed, translating them to win32 calls to modify the state of the terminal, to make it easier to port Python code using ANSI to Windows. Cygwin performs similar translation to all output written to the console using Cygwin file descriptors, the filtering is done by the output functions of Шаблон:Mono, to allow porting of POSIX C code to Windows.
In 2016, Microsoft released the Windows 10 version 1511 update which unexpectedly implemented support for ANSI escape sequences, over two decades after the debut of Windows NT.[12] This was done alongside Windows Subsystem for Linux, allowing Unix-like terminal-based software to use the sequences in Windows Console. This defaults to off, but Windows PowerShell 5.1 enabled it. PowerShell 6 made it possible to embed the necessary ESC character into a string with Шаблон:Code.[13]
Windows Terminal, introduced in 2019, supports the sequences by default, and Microsoft intends to replace the Windows Console with Windows Terminal.[14]
Description
C0 control codes
Almost all users assume some functions of some single-byte characters. Initially defined as part of ASCII, the default C0 control code set is now defined in ISO 6429 (ECMA-48), making it part of the same standard as the C1 set invoked by the ANSI escape sequences (although ISO 2022 allows the ISO 6429 C0 set to be used without the ISO 6429 C1 set, and vice versa, provided that 0x1B is always ESC). This is used to shorten the amount of data transmitted, or to perform some functions that are unavailable from escape sequences:
^ | C0 | Abbr | Name | Effect |
---|---|---|---|---|
Шаблон:Tt | 0x07 | Шаблон:Tt | Bell | Makes an audible noise. |
Шаблон:Tt | 0x08 | Шаблон:Tt | Backspace | Moves the cursor left (but may "backwards wrap" if cursor is at start of line). |
Шаблон:Tt | 0x09 | Шаблон:Tt | Tab | Moves the cursor right to next multiple of 8. |
Шаблон:Tt | 0x0A | Шаблон:Tt | Line Feed | Moves to next line, scrolls the display up if at bottom of the screen. Usually does not move horizontally, though programs should not rely on this. |
Шаблон:Tt | 0x0C | Шаблон:Tt | Form Feed | Move a printer to top of next page. Usually does not move horizontally, though programs should not rely on this. Effect on video terminals varies. |
Шаблон:Tt | 0x0D | Шаблон:Tt | Carriage Return | Moves the cursor to column zero. |
Шаблон:Tt | 0x1B | Шаблон:Tt | Escape | Starts all the escape sequences |
Escape sequences vary in length. The general format for an ANSI-compliant escape sequence is defined by ANSI X3.41 (equivalent to ECMA-35 or ISO/IEC 2022).[15]Шаблон:Rp The escape sequences consist only of bytes in the range Шаблон:Tt (all the non-control ASCII characters), and can be parsed without looking ahead. The behavior when a control character, a byte with the high bit set, or a byte that is not part of any valid sequence, is encountered before the end is undefined.
Fe Escape sequences
If the [[#ESC|Шаблон:Code]] is followed by a byte in the range 0x40 to 0x5F, the escape sequence is of type Шаблон:Code. Its interpretation is delegated to the applicable C1 control code standard.[15]Шаблон:Rp Accordingly, all escape sequences corresponding to C1 control codes from ANSI X3.64 / ECMA-48 follow this format.[5]Шаблон:Rp
The standard says that, in 8-bit environments, the control functions corresponding to type Шаблон:Code escape sequences (those from the set of C1 control codes) can be represented as single bytes in the 0x80–0x9F range.[5]Шаблон:Rp This is possible in character encodings conforming to the provisions for an 8-bit code made in ISO 2022, such as the ISO 8859 series. However, in character encodings used on modern devices such as UTF-8 or CP-1252, those codes are often used for other purposes, so only the 2-byte sequence is typically used. In the case of UTF-8, representing a C1 control code via the C1 Controls and Latin-1 Supplement block results in a different two-byte code (e.g. Шаблон:Tt for Шаблон:Tt), but no space is saved this way.
Code | C1 | Abbr | Name | Effect |
---|---|---|---|---|
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Single Shift Two | Select a single character from one of the alternative character sets. SS2 selects the G2 character set, and SS3 selects the G3 character set.[16] In a 7-bit environment, this is followed by one or more GL bytes (0x20–0x7F) specifying a character from that set.[15]Шаблон:Rp In an 8-bit environment, these may instead be GR bytes (0xA0–0xFF).[15]Шаблон:Rp |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Single Shift Three | |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Device Control String | Terminated by ST.[5]Шаблон:Rp Xterm's uses of this sequence include defining User-Defined Keys, and requesting or setting Termcap/Terminfo data.[16] |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Control Sequence Introducer | Starts most of the useful sequences, terminated by a byte in the range 0x40 through 0x7E.[5]Шаблон:Rp |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | String Terminator | Terminates strings in other controls.[5]Шаблон:Rp |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Operating System Command | Starts a control string for the operating system to use, terminated by ST.[5]Шаблон:Rp |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Start of String | Takes an argument of a string of text, terminated by ST.[5]Шаблон:Rp The uses for these string control sequences are defined by the application[5]Шаблон:Rp or privacy discipline.[5]Шаблон:Rp These functions are rarely implemented and the arguments are ignored by xterm.[16] Some Kermit clients allow the server to automatically execute Kermit commands on the client by embedding them in APC sequences; this is a potential security risk if the server is untrusted.[17] |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Privacy Message | |
Шаблон:Tt | Шаблон:Tt | Шаблон:Tt | Application Program Command |
Шаблон:Anchor Шаблон:Anchor Шаблон:Anchor Шаблон:Anchor Шаблон:Anchor Шаблон:Anchor Шаблон:Anchor Шаблон:Anchor
Шаблон:Anchor CSI (Control Sequence Introducer) sequences
For Control Sequence Introducer, or CSI, commands, the Шаблон:Code (written as Шаблон:Code or Шаблон:Code in several programming languages) is followed by any number (including none) of "parameter bytes" in the range 0x30–0x3F (ASCII 0–9:;<=>?
), then by any number of "intermediate bytes" in the range 0x20–0x2F (ASCII space and Шаблон:Code), then finally by a single "final byte" in the range 0x40–0x7E (ASCII @A–Z[\]^_`a–z{|}~
).[5]Шаблон:Rp
All common sequences just use the parameters as a series of semicolon-separated numbers such as Шаблон:Code. Missing numbers are treated as Шаблон:Code (Шаблон:Code acts like the middle number is Шаблон:Code, and no parameters at all in Шаблон:Code acts like a Шаблон:Code reset code). Some sequences (such as CUU) treat Шаблон:Code as Шаблон:Code in order to make missing parameters useful.[5]Шаблон:Rp
A subset of arrangements was declared "private" so that terminal manufacturers could insert their own sequences without conflicting with the standard. Sequences containing the parameter bytes <=>?
or the final bytes 0x70–0x7E (p–z{|}~
) are private.
The behavior of the terminal is undefined in the case where a CSI sequence contains any character outside of the range 0x20–0x7E. These illegal characters are either C0 control characters (the range 0–0x1F), DEL (0x7F), or bytes with the high bit set. Possible responses are to ignore the byte, to process it immediately, and furthermore whether to continue with the CSI sequence, to abort it immediately, or to ignore the rest of it.Шаблон:Citation needed
Code | Abbr | Name | Effect |
---|---|---|---|
CSI Шаблон:Var A | Шаблон:Tt | Cursor Up | Moves the cursor Шаблон:Var (default Шаблон:Code) cells in the given direction. If the cursor is already at the edge of the screen, this has no effect. |
CSI Шаблон:Var B | Шаблон:Tt | Cursor Down | |
CSI Шаблон:Var C | Шаблон:Tt | Cursor Forward | |
CSI Шаблон:Var D | Шаблон:Tt | Cursor Back | |
CSI Шаблон:Var E | Шаблон:Tt | Cursor Next Line | Moves cursor to beginning of the line Шаблон:Var (default Шаблон:Code) lines down. (not ANSI.SYS) |
CSI Шаблон:Var F | Шаблон:Tt | Cursor Previous Line | Moves cursor to beginning of the line Шаблон:Var (default Шаблон:Code) lines up. (not ANSI.SYS) |
CSI Шаблон:Var G | Шаблон:Tt | Cursor Horizontal Absolute | Moves the cursor to column Шаблон:Var (default Шаблон:Code). (not ANSI.SYS) |
CSI Шаблон:Var ; Шаблон:Var H | Шаблон:Tt | Cursor Position | Moves the cursor to row Шаблон:Var, column Шаблон:Var. The values are 1-based, and default to Шаблон:Code (top left corner) if omitted. A sequence such as Шаблон:Code is a synonym for Шаблон:Code as well as Шаблон:Code is the same as Шаблон:Code and Шаблон:Code |
CSI Шаблон:Var J | Шаблон:Tt | Erase in Display | Clears part of the screen. If Шаблон:Var is Шаблон:Code (or missing), clear from cursor to end of screen. If Шаблон:Var is Шаблон:Code, clear from cursor to beginning of the screen. If Шаблон:Var is Шаблон:Code, clear entire screen (and moves cursor to upper left on DOS ANSI.SYS). If Шаблон:Var is Шаблон:Code, clear entire screen and delete all lines saved in the scrollback buffer (this feature was added for xterm and is supported by other terminal applications). |
CSI Шаблон:Var K | Шаблон:Tt | Erase in Line | Erases part of the line. If Шаблон:Var is Шаблон:Code (or missing), clear from cursor to the end of the line. If Шаблон:Var is Шаблон:Code, clear from cursor to beginning of the line. If Шаблон:Var is Шаблон:Code, clear entire line. Cursor position does not change. |
CSI Шаблон:Var S | Шаблон:Tt | Scroll Up | Scroll whole page up by Шаблон:Var (default Шаблон:Code) lines. New lines are added at the bottom. (not ANSI.SYS) |
CSI Шаблон:Var T | Шаблон:Tt | Scroll Down | Scroll whole page down by Шаблон:Var (default Шаблон:Code) lines. New lines are added at the top. (not ANSI.SYS) |
CSI Шаблон:Var ; Шаблон:Var f | Шаблон:Tt | Horizontal Vertical Position | Same as CUP, but counts as a format effector function (like Шаблон:Control code link or Шаблон:Control code link) rather than an editor function (like CUD or CNL). This can lead to different handling in certain terminal modes.[5]Шаблон:Rp |
CSI Шаблон:Var m | Шаблон:Tt | Select Graphic Rendition | Sets colors and style of the characters following this code |
CSI 5i | AUX Port On | Enable aux serial port usually for local serial printer | |
CSI 4i | AUX Port Off | Disable aux serial port usually for local serial printer | |
CSI 6n | Шаблон:Tt | Device Status Report | Reports the cursor position (CPR) by transmitting Шаблон:Code, where Шаблон:Var is the row and Шаблон:Var is the column. |
Code | Abbr | Name | Effect |
---|---|---|---|
CSI s | Шаблон:Tt | Save Current Cursor Position | Saves the cursor position/state in SCO console mode.[18] In vertical split screen mode, instead used to set (as CSI n ; n s ) or reset left and right margins.[19]
|
CSI u | Шаблон:Tt | Restore Saved Cursor Position | Restores the cursor position/state in SCO console mode.[20] |
CSI ? 25 h | Шаблон:Tt | Shows the cursor, from the VT220. | |
CSI ? 25 l | Шаблон:Tt | Hides the cursor. | |
CSI ? 1004 h | Enable reporting focus. Reports whenever terminal emulator enters or exits focus as Шаблон:Code and Шаблон:Code, respectively. | ||
CSI ? 1004 l | Disable reporting focus. | ||
CSI ? 1049 h | Enable alternative screen buffer, from xterm | ||
CSI ? 1049 l | Disable alternative screen buffer, from xterm | ||
CSI ? 2004 h | Turn on bracketed paste mode.[21] In bracketed paste mode, text pasted into the terminal will be surrounded by Шаблон:Code and Шаблон:Code; programs running in the terminal should not treat characters bracketed by those sequences as commands (Vim, for example, does not treat them as commands).[22] From xterm[23] | ||
CSI ? 2004 l | Turn off bracketed paste mode. |
Шаблон:Anchor SGR (Select Graphic Rendition) parameters
The control sequence CSI Шаблон:Var m
, named Select Graphic Rendition (SGR), sets display attributes. Several attributes can be set in the same sequence, separated by semicolons.[24] Each display attribute remains in effect until a following occurrence of SGR resets it.[5] If no codes are given, Шаблон:Code is treated as Шаблон:Code (reset / normal).
n | Name | Note |
---|---|---|
Шаблон:Tt | Reset or normal | All attributes become turned off |
Шаблон:Tt | Bold or increased intensity | As with faint, the color change is a PC (SCO / CGA) invention.[25]Шаблон:Better source needed |
Шаблон:Tt | Faint, decreased intensity, or dim | May be implemented as a light font weight like bold.[26] |
Шаблон:Tt | Italic | Not widely supported. Sometimes treated as inverse or blink.[25] |
Шаблон:Tt | Underline | Style extensions exist for Kitty, VTE, mintty, iTerm2 and Konsole.[27][28][29] |
Шаблон:Tt | Slow blink | Sets blinking to less than 150 times per minute |
Шаблон:Tt | Rapid blink | MS-DOS ANSI.SYS, 150+ per minute; not widely supported |
Шаблон:Tt | Reverse video or invert | Swap foreground and background colors; inconsistent emulation[30]Шаблон:Dubious |
Шаблон:Tt | Conceal or hide | Not widely supported. |
Шаблон:Tt | Crossed-out, or strike | Characters legible but marked as if for deletion. Not supported in Terminal.app. |
Шаблон:Tt | Primary (default) font | |
Шаблон:Tt | Alternative font | Select alternative font Шаблон:Math |
Шаблон:Tt | Fraktur (Gothic) | Rarely supported |
Шаблон:Tt | Doubly underlined; or: not bold | Double-underline per ECMA-48,[5]Шаблон:Rp but instead disables bold intensity on several terminals, including in the Linux kernel's console before version 4.17.[31] |
Шаблон:Tt | Normal intensity | Neither bold nor faint; color changes where intensity is implemented as such. |
Шаблон:Tt | Neither italic, nor blackletter | |
Шаблон:Tt | Not underlined | Neither singly nor doubly underlined |
Шаблон:Tt | Not blinking | Turn blinking off |
Шаблон:Tt | Proportional spacing | ITU T.61 and T.416, not known to be used on terminals |
Шаблон:Tt | Not reversed | |
Шаблон:Tt | Reveal | Not concealed |
Шаблон:Tt | Not crossed out | |
Шаблон:Tt | Set foreground color | |
Шаблон:Tt | Set foreground color | [[#8-bit|Next arguments are Шаблон:Code or Шаблон:Code]] |
Шаблон:Tt | Default foreground color | Implementation defined (according to standard) |
Шаблон:Tt | Set background color | |
Шаблон:Tt | Set background color | [[#8-bit|Next arguments are Шаблон:Code or Шаблон:Code]] |
Шаблон:Tt | Default background color | Implementation defined (according to standard) |
Шаблон:Tt | Disable proportional spacing | T.61 and T.416 |
Шаблон:Tt | Framed | Implemented as "emoji variation selector" in mintty.[32] |
Шаблон:Tt | Encircled | |
Шаблон:Tt | Overlined | Not supported in Terminal.app |
Шаблон:Tt | Neither framed nor encircled | |
Шаблон:Tt | Not overlined | |
Шаблон:Tt | Set underline color | Not in standard; implemented in Kitty, VTE, mintty, and iTerm2.[27][28] [[#8-bit|Next arguments are Шаблон:Code or Шаблон:Code]]. |
Шаблон:Tt | Default underline color | Not in standard; implemented in Kitty, VTE, mintty, and iTerm2.[27][28] |
Шаблон:Tt | Ideogram underline or right side line | Rarely supported |
Шаблон:Tt | Ideogram double underline, or double line on the right side | |
Шаблон:Tt | Ideogram overline or left side line | |
Шаблон:Tt | Ideogram double overline, or double line on the left side | |
Шаблон:Tt | Ideogram stress marking | |
Шаблон:Tt | No ideogram attributes | Reset the effects of all of Шаблон:Code–Шаблон:Code |
Шаблон:Tt | Superscript | Implemented only in mintty[32] |
Шаблон:Tt | Subscript | |
Шаблон:Tt | Neither superscript nor subscript | |
Шаблон:Tt | Set bright foreground color | Not in standard; originally implemented by aixterm[16] |
Шаблон:Tt | Set bright background color |
Colors
3-bit and 4-bit
The original specification only had 8 colors, and just gave them names. The SGR parameters 30–37 selected the foreground color, while 40–47 selected the background. Quite a few terminals implemented "bold" (SGR code 1) as a brighter color rather than a different font, thus providing 8 additional foreground colors. Usually you could not get these as background colors, though sometimes inverse video (SGR code 7) would allow that. Examples: to get black letters on white background use Шаблон:Code, to get red use Шаблон:Code, to get bright red use Шаблон:Code. To reset colors to their defaults, use Шаблон:Code (not supported on some terminals), or reset all attributes with Шаблон:Code. Later terminals added the ability to directly specify the "bright" colors with 90–97 and 100–107.
The chart below shows a few examples of how VGA standard and modern terminal emulators translate the 4-bit color codes into 24-bit color codes.
8-bit
As 256-color lookup tables became common on graphic cards, escape sequences were added to select from a pre-defined set of 256 colors:Шаблон:Citation needed
ESC[38;5;Шаблон:Angbrm Select foreground color where n is a number from the table below ESC[48;5;Шаблон:Angbrm Select background color 0- 7: standard colors (as in ESC [ 30–37 m) 8- 15: high intensity colors (as in ESC [ 90–97 m) 16-231: 6 × 6 × 6 cube (216 colors): 16 + 36 × r + 6 × g + b (0 ≤ r, g, b ≤ 5) 232-255: grayscale from dark to light in 24 steps
The ITU's T.416 Information technology - Open Document Architecture (ODA) and interchange format: Character content architectures[35] uses ":" as separator characters instead:
ESC[38:5:Шаблон:Angbrm Select foreground color where n is a number from the table below ESC[48:5:Шаблон:Angbrm Select background color
256-color mode — foreground: ESC[38;5;#m background: ESC[48;5;#m | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Standard colors | High-intensity colors | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
216 colors | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | ||||||||||||||||||||||||
52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | ||||||||||||||||||||||||
88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | ||||||||||||||||||||||||
124 | 125 | 126 | 127 | 128 | 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143 | 144 | 145 | 146 | 147 | 148 | 149 | 150 | 151 | 152 | 153 | 154 | 155 | 156 | 157 | 158 | 159 | ||||||||||||||||||||||||
160 | 161 | 162 | 163 | 164 | 165 | 166 | 167 | 168 | 169 | 170 | 171 | 172 | 173 | 174 | 175 | 176 | 177 | 178 | 179 | 180 | 181 | 182 | 183 | 184 | 185 | 186 | 187 | 188 | 189 | 190 | 191 | 192 | 193 | 194 | 195 | ||||||||||||||||||||||||
196 | 197 | 198 | 199 | 200 | 201 | 202 | 203 | 204 | 205 | 206 | 207 | 208 | 209 | 210 | 211 | 212 | 213 | 214 | 215 | 216 | 217 | 218 | 219 | 220 | 221 | 222 | 223 | 224 | 225 | 226 | 227 | 228 | 229 | 230 | 231 | ||||||||||||||||||||||||
Grayscale colors | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
There has also been a similar but incompatible 88-color encoding using the same escape sequence, seen in Шаблон:Code and Шаблон:Code. Not much is known about the scheme besides the color codes. It uses a 4×4×4 color cube.
24-bit
As "true color" graphic cards with 16 to 24 bits of color became common, applications began to support 24-bit colors. Terminal emulators supporting setting 24-bit foreground and background colors with escape sequences include Xterm,[16] KDE's Konsole,[36][37] and iTerm, as well as all libvte based terminals,[38] including GNOME Terminal.Шаблон:Citation needed
ESC[38;2;Шаблон:Angbr;Шаблон:Angbr;Шаблон:Angbr m Select RGB foreground color ESC[48;2;Шаблон:Angbr;Шаблон:Angbr;Шаблон:Angbr m Select RGB background color
The syntax is likely based on the ITU's T.416 Open Document Architecture (ODA) and interchange format: Character content architectures,[35] which was adopted as ISO/IEC 8613-6 but ended up as a commercial failure.Шаблон:Cn The ODA version is more elaborate and thus incompatible:
- The parameters after the '2' (r, g, and b) are optional and can be left empty.
- Semicolons are replaced by colons, as above.
- There is a leading "colorspace ID".[16] The definition of the colorspace ID is not included in that document so it may be blank to represent the unspecified default.
- In addition to the '2' value after 48 to specify a Red-Green-Blue format (and the '5' above for a 0-255 indexed color), there are alternatives of '0' for implementation-defined and '1' for transparent - neither of which have any further parameters; '3' specifies colors using a Cyan-Magenta-Yellow scheme, and '4' for a Cyan-Magenta-Yellow-Black one, the latter using the position marked as "unused" for the Black component:[35]
ESC[38:2:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr m Select RGB foreground color ESC[48:2:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr:Шаблон:Angbr m Select RGB background color
The ITU-RGB variation is supported by xterm, with the colorspace ID and tolerance parameters ignored. The simpler scheme using semicolons is initially found in Konsole.[16]Шаблон:Rp
Unix environment variables relating to color support
Before termcap and terminfo could indicate support for colors, the S-Lang library used Шаблон:Code to indicate whether a terminal emulator could use colors at all, and later added values to indicate if it supported 24-bit color.[39][40] This system, although poorly documented, became widespread enough for Fedora and RHEL to consider using it as a simpler and more universal detection mechanism compared to querying the now-updated libraries.[41]
Some terminal emulators (urxvt, konsole) set Шаблон:Code to report the color scheme of the terminal (mainly light vs. dark background). This behavior originated in S-Lang[40] and is used by vim. Gnome-terminal refuses to add this behavior, as the syntax for the value is not agreed upon, the value cannot be changed upon a runtime change of the palette, and more "proper" xterm OSC 4/10/11 sequences already exist.[42]
Шаблон:Anchor OSC (Operating System Command) sequences
Most Operating System Command sequences were defined by Xterm, but many are also supported by other terminal emulators. For historical reasons, Xterm can end the command with [[Bell character|Шаблон:Code]] (0x07) as well as the standard Шаблон:Code (0x9C or 0x1B 0x5C).[16] For example, Xterm allows the window title to be set by Шаблон:Code.
A non-xterm extension is the hyperlink, Шаблон:Code from 2017, used by VTE,[43]Шаблон:Discuss iTerm2,[43] and mintty,[44] among others.[45]
The Linux console uses Шаблон:Code to change the palette, which, if hard-coded into an application, may hang other terminals.[46] However, appending Шаблон:Code will be ignored by Linux and form a proper, ignorable sequence for other terminals.Шаблон:Citation needed
Fs Escape sequences
If the Шаблон:Code is followed by a byte in the range Шаблон:Tt, the escape sequence is of type Шаблон:Code. This type is used for control functions individually registered with the ISO-IR registry[47]. A table of these is listed under ISO/IEC 2022.
Fp Escape sequences
If the Шаблон:Code is followed by a byte in the range Шаблон:Tt, the escape sequence is of type Шаблон:Code, which is set apart for up to sixteen private-use control functions.[15]Шаблон:Rp
Abbr | Name | Effect | |
---|---|---|---|
Шаблон:Tt | Шаблон:Tt | DEC Save Cursor | Saves the cursor position, encoding shift state and formatting attributes.[48][16] |
Шаблон:Tt | Шаблон:Tt | DEC Restore Cursor | Restores the cursor position, encoding shift state and formatting attributes from the previous DECSC if any, otherwise resets these all to their defaults.[48][16] |
nF Escape sequences
If the Шаблон:Code is followed by a byte in the range Шаблон:Tt, the escape sequence is of type Шаблон:Code. Said byte is followed by any number of additional bytes in this range, and then a byte in the range Шаблон:Tt. These escape sequences are further subcategorised by the low two bits of the first byte, e.g. "type Шаблон:Code" for sequences where the first byte is Шаблон:Tt; and by whether the final byte is in the range Шаблон:Tt indicating private use (e.g. "type Шаблон:Code") or not (e.g. "type Шаблон:Code").[15]Шаблон:Rp
Most of the Шаблон:Code sequences are for changing the current character set, and are listed in ISO/IEC 2022. Some others:
Abbr | Name | Effect | |
---|---|---|---|
Шаблон:Tt | Шаблон:Plainlist | Шаблон:Plainlist | Makes the function keys send ESC + letter instead of 8-bit C1 codes. |
Шаблон:Tt | Шаблон:Plainlist | Шаблон:Plainlist | Makes the function keys send 8-bit C1 codes. |
If the first byte is '#' the public sequences are reserved for additional ISO-IR registered individual control functions.[15]Шаблон:Rp No such sequences are presently registered.[47] Type Шаблон:Code sequences (which includes ones starting with '#') are available for private-use control functions.[15]Шаблон:Rp
Abbr | Name | Effect | |
---|---|---|---|
Шаблон:Tt | Шаблон:Tt | DEC Double-Height Letters, Top Half | Makes the current line use characters twice as tall. This code is for the top half.[49] |
Шаблон:Tt | Шаблон:Tt | DEC Double-Height Letters, Bottom Half | Makes the current line use characters twice as tall. This code is for the bottom half.[49] |
Шаблон:Tt | Шаблон:Tt | DEC Single-Width Line | Makes the current line use single-width characters, per the default behaviour.[50][16] |
Шаблон:Tt | Шаблон:Tt | Шаблон:Nowrap | Makes the current line use double-width characters, discarding any characters in the second half of the line.[51][16] |
Examples
Шаблон:Code — This clears the screen and, on some devices, locates the cursor to the y,x position 1,1 (upper left corner).
Шаблон:Code — This makes text green. The green may be a dark, dull green, so you may wish to enable Bold with the sequence Шаблон:Code which would make it bright green, or combined as Шаблон:Code. Some implementations use the Bold state to make the character Bright.
Шаблон:Code — This reassigns the key F10 to send to the keyboard buffer the string "DIR" and ENTER, which in the DOS command line would display the contents of the current directory. (MS-DOS ANSI.SYS only) This was sometimes used for ANSI bombs. This is a private-use code (as indicated by the letter p), using a non-standard extension to include a string-valued parameter. Following the letter of the standard would consider the sequence to end at the letter D.
Шаблон:Code — This saves the cursor position. Using the sequence Шаблон:Code will restore it to the position. Say the current cursor position is 7(y) and 10(x). The sequence Шаблон:Code will save those two numbers. Now you can move to a different cursor position, such as 20(y) and 3(x), using the sequence Шаблон:Code or Шаблон:Code. Now if you use the sequence CSI u the cursor position will return to 7(y) and 10(x). Some terminals require the DEC sequences Шаблон:Code / Шаблон:Code instead which is more widely supported.
In shell scripting
ANSI escape codes are often used in UNIX and UNIX-like terminals to provide syntax highlighting. For example, on compatible terminals, the following list command color-codes file and directory names by type.
Users can employ escape codes in their scripts by including them as part of standard output or standard error. For example, the following GNU sed command embellishes the output of the make command by displaying lines containing words starting with "WARN" in reverse video and words starting with "ERR" in bright yellow on a dark red background (letter case is ignored). The representations of the codes are highlighted.[52]
make 2>&1 | sed -e 's/.*\bWARN.*/\x1b[7m&\x1b[0m/i' -e 's/.*\bERR.*/\x1b[93;41m&\x1b[0m/i'
The following Bash function flashes the terminal (by alternately sending reverse and normal video mode codes) until the user presses a key.[53]
Шаблон:Codett \\e[?5hШаблон:Codett \\e[?5lШаблон:Codett
This can be used to alert a programmer when a lengthy command terminates, such as with Шаблон:CodeШаблон:Thin space.[54]
Шаблон:Sxhl
This will reset the console, similar to the command Шаблон:Code on modern Linux systems; however it should work even on older Linux systems and on other (non-Linux) UNIX variants.
In C
#include <stdio.h>
int main(void)
{
int i, j, n;
for (i = 0; i < 11; i++) {
for (j = 0; j < 10; j++) {
n = 10 * i + j;
if (n > 108) break;
printf("\033[%dm %3d\033[m", n, n);
}
printf("\n");
}
return 0;
}
Terminal input sequences
Шаблон:More citations needed Pressing special keys on the keyboard, as well as outputting many xterm CSI, DCS, or OSC sequences, often produces a CSI, DCS, or OSC sequence, sent from the terminal to the computer as though the user typed it.
When typing input on a terminal keypresses outside the normal main alphanumeric keyboard area can be sent to the host as ANSI sequences. For keys that have an equivalent output function, such as the cursor keys, these often mirror the output sequences. However, for most keypresses there isn't an equivalent output sequence to use.
There are several encoding schemes, and unfortunately most terminals mix sequences from different schemes, so host software has to be able to deal with input sequences using any scheme. To complicate the matter, the VT terminals themselves have two schemes of input, normal mode and application mode that can be switched by the application.
(draft section)
<char> -> char <esc> <nochar> -> esc <esc> <esc> -> esc <esc> <char> -> Alt-keypress or keycode sequence <esc> '[' <nochar> -> Alt-[ <esc> '[' (<modifier>) <char> -> keycode sequence, <modifier> is a decimal number and defaults to 1 (xterm) <esc> '[' (<keycode>) (';'<modifier>) '~' -> keycode sequence, <keycode> and <modifier> are decimal numbers and default to 1 (vt)
If the terminating character is '~', the first number must be present and is a keycode number, the second number is an optional modifier value. If the terminating character is a letter, the letter is the keycode value, and the optional number is the modifier value.
The modifier value defaults to 1, and after subtracting 1 is a bitmap of modifier
keys being pressed: Шаблон:Keypress. So, for example, <esc>[4;2~
is
Шаблон:Keypress, <esc>[20~
is function key Шаблон:Keypress, <esc>[5C
is Шаблон:Keypress.
In other words, the modifier is the sum of the following numbers:
Key pressed | Number | Comment |
---|---|---|
1 | always added, the rest are optional | |
Shift | 1 | |
(Left) Alt | 2 | |
Control | 4 | |
Meta | 8 |
vt sequences: <esc>[1~ - Home <esc>[16~ - <esc>[31~ - F17 <esc>[2~ - Insert <esc>[17~ - F6 <esc>[32~ - F18 <esc>[3~ - Delete <esc>[18~ - F7 <esc>[33~ - F19 <esc>[4~ - End <esc>[19~ - F8 <esc>[34~ - F20 <esc>[5~ - PgUp <esc>[20~ - F9 <esc>[35~ - <esc>[6~ - PgDn <esc>[21~ - F10 <esc>[7~ - Home <esc>[22~ - <esc>[8~ - End <esc>[23~ - F11 <esc>[9~ - <esc>[24~ - F12 <esc>[10~ - F0 <esc>[25~ - F13 <esc>[11~ - F1 <esc>[26~ - F14 <esc>[12~ - F2 <esc>[27~ - <esc>[13~ - F3 <esc>[28~ - F15 <esc>[14~ - F4 <esc>[29~ - F16 <esc>[15~ - F5 <esc>[30~ - xterm sequences: <esc>[A - Up <esc>[K - <esc>[U - <esc>[B - Down <esc>[L - <esc>[V - <esc>[C - Right <esc>[M - <esc>[W - <esc>[D - Left <esc>[N - <esc>[X - <esc>[E - <esc>[O - <esc>[Y - <esc>[F - End <esc>[1P - F1 <esc>[Z - <esc>[G - Keypad 5 <esc>[1Q - F2 <esc>[H - Home <esc>[1R - F3 <esc>[I - <esc>[1S - F4 <esc>[J - <esc>[T -
<esc>[A
to <esc>[D
are the same as the ANSI output sequences. The <modifier>
is normally omitted if no modifier keys are pressed, but most implementations always emit the <modifier>
for Шаблон:Keypress. (draft section)
Xterm has a comprehensive documentation page on the various function-key and mouse input sequence schemes from DEC's VT terminals and various other terminals it emulates.[16] Thomas Dickey has added a lot of support to it over time;[55] he also maintains a list of default keys used by other terminal emulators for comparison.[56]
- On the Linux console, certain function keys generate sequences of the form
CSI [ char
. The CSI sequence should terminate on the[
. - Old versions of Terminator generate
SS3 1; modifiers char
when Шаблон:Keypress are pressed with modifiers. The faulty behavior was copied from GNOME Terminal.Шаблон:Citation needed - xterm replies
CSI row ; column R
if asked for cursor position andCSI 1 ; modifiers R
if the Шаблон:Keypress key is pressed with modifiers, which collide in the case ofrow == 1
. This can be avoided by using the ? private modifier asCSI ? 6 n
, which will be reflected in the response asCSI ? row ; column R
. - many terminals prepend
ESC
to any character that is typed with the alt key down. This creates ambiguity for uppercase letters and symbols@[\]^_
, which would form C1 codes.Шаблон:Clarify - Konsole generates
SS3 modifiers char
when Шаблон:Keypress are pressed with modifiers.Шаблон:Clarify - iTerm2 supports reporting additional keys via an enhanced CSI u mode.[57]
See also
- ANSI art
- Control character
- Advanced Video Attribute Terminal Assembler and Recreator (AVATAR)
- ISO/IEC JTC 1/SC 2
- C0 and C1 control codes
Notes
References
External links
- Standard ECMA-48, Control Functions For Coded Character Sets. (5th edition, June 1991), European Computer Manufacturers Association, Geneva 1991 (also published by ISO and IEC as standard ISO/IEC 6429)
- vt100.net DEC Documents
- Шаблон:Cite web
- Xterm / Escape Sequences
- AIXterm / Escape Sequences
- A collection of escape sequences for terminals that are vaguely compliant with ECMA-48 and friends.
- Шаблон:Cite web
- ITU-T Rec. T.416 (03/93) Information technology – Open Document Architecture (ODA) and interchange format: Character content architectures
Шаблон:Character encoding Шаблон:Ecma International Standards Шаблон:ISO standards Шаблон:List of International Electrotechnical Commission standards
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
<ref>
; для сносокECMA-48 (1979)
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокWilliams_2006_VT
не указан текст - ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 5,00 5,01 5,02 5,03 5,04 5,05 5,06 5,07 5,08 5,09 5,10 5,11 5,12 5,13 5,14 Ошибка цитирования Неверный тег
<ref>
; для сносокECMA-48
не указан текст - ↑ Шаблон:Cite web
- ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокParagon_2000_PTS-DOS
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокEllsässer_2004_PTSDOS
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокCCI_1997_HELP
не указан текст - ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 15,0 15,1 15,2 15,3 15,4 15,5 15,6 15,7 15,8 Ошибка цитирования Неверный тег
<ref>
; для сносокECMA-35
не указан текст - ↑ 16,00 16,01 16,02 16,03 16,04 16,05 16,06 16,07 16,08 16,09 16,10 16,11 16,12 16,13 Шаблон:Cite web
- ↑ Шаблон:Cite book
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 25,0 25,1 Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 27,0 27,1 27,2 Шаблон:Cite web
- ↑ 28,0 28,1 28,2 Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 32,0 32,1 Шаблон:Cite web
- ↑ Changed from 0,Шаблон:Nnbsp0,Шаблон:Nnbsp205 in July 2004 Шаблон:Cite web
- ↑ Changed from 0,Шаблон:Nnbsp0,Шаблон:Nnbsp255 in July 2004 Шаблон:Cite web
- ↑ 35,0 35,1 35,2 Шаблон:Cite web
- ↑ Шаблон:Cite webШаблон:Dead link
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 40,0 40,1 Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 43,0 43,1 Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ 47,0 47,1 Шаблон:Citation
- ↑ 48,0 48,1 Шаблон:Citation
- ↑ 49,0 49,1 Шаблон:Citation
- ↑ Шаблон:Citation
- ↑ Шаблон:Citation
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
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