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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11An ANSI escape code is a control sequence embedded in text that a terminal interprets to perform an action—such as styling text, moving the cursor, or clearing part of the display—instead of showing the sequence as ordinary text. Its familiar form begins with the Escape character followed by an opening bracket: ESC [, often written in code as x1b[.
What does x1b[ mean?
x1b represents the ASCII Escape control character, also written as ESC or, in some programming contexts, 33. The bracket after it introduces a CSI (Control Sequence Introducer) sequence. For example, x1b[31m is a CSI sequence whose final character, m, selects a text-display attribute through SGR (Select Graphic Rendition); the parameter 31 commonly requests red foreground text.
The characters shown in a code example are a readable notation for control bytes in a data stream. A terminal that recognizes the sequence interprets it as an instruction; it does not ordinarily print the instruction as visible text. If a program displays the characters literally, the receiving application may not be interpreting them as terminal control data.
How is an ANSI escape code structured?
In common usage, “ANSI escape code” is an umbrella term for terminal control sequences. A typical CSI sequence has an introducer, optional parameter and intermediate bytes, and a final character. Its structure and final character identify the control function, while any parameters modify the action. The ECMA-48 standard distinguishes an escape sequence from a control sequence: an escape sequence begins with the ESCAPE control function, while a control sequence begins with CSI.
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The familiar seven-bit CSI form is ESC [ (often represented as x1b[). ECMA-48 also defines an eight-bit CSI representation, the byte 0x9B, as described in the GNU Teseq manual. Which representation appears depends on the encoding and context; the bracket form is the one most often seen in programming examples.
What can these sequences do?
CSI sequences can control more than color. Terminal behavior depends on the particular function and implementation; examples include:
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- Set or reset text attributes: SGR sequences use final character
mto request display attributes such as color or emphasis. - Move the cursor: Some CSI functions position the cursor within the display.
- Scroll: Some functions control scrolling behavior.
- Erase display content: Other functions clear text or portions of the display.
The Linux console_codes(4) reference and the ANSI-BBS control-sequence compilation document examples of SGR and other CSI functions. These references describe particular environments or compilations, not a guarantee that every terminal supports every sequence in the same way.
Why is “ANSI escape code” not always precise?
The phrase is convenient, but it conflates related terms. In ECMA-48 terminology, an escape sequence begins with ESC and belongs to code-extension procedures; a control sequence begins with CSI and represents a control function, with or without parameters. Many sequences casually called ANSI escape codes are specifically CSI control sequences, including the familiar x1b[...m form.
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For everyday terminal discussions, “ANSI escape code” is widely understood. When accuracy matters, name the sequence family—for example, an SGR or CSI sequence—and specify the target terminal. A standard describes control functions, but does not ensure every terminal implements every function or private extension identically.
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