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Asked: 2026-06-01T11:10:50+00:00

I need help identifying what these ANSI escape sequences represent. I’m currently filtering/evaluating the

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I need help identifying what these ANSI escape sequences represent. I’m currently filtering/evaluating the ANSI codes in a terminal screen reader I’m writing, but I’m not sure what these are.

Escape Sequences:

[0;1mm

[0;1;;4m

I’m using the below chart of escape sequences as reference:
http://ascii-table.com/ansi-escape-sequences-vt-100.php

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1 Answer

  1. Editorial Team

    ECMA-48 is the primary source of these.

    As to your specific examples:

    [0;1mm

    Is SGR (select graphic rendition) 0 and 1, followed by a normal unescaped m. SGR 0 resets all the rendition attributes, 1 enables bold.

    [0;1;;4m

    Is SGR 0, 1, 4. 0 resets, 1 enables bold, 4 enables single underline.

    EDIT: Actually, I believe this second example is equivalent to

    CSI 0;1;0;4 m

    which resets, enables bold, resets a second time, then enables underline. So overall, only enables underline, not bold.

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