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I found gnu head ANSI art (that show up in alsmot grayscale on Cygwin terminal)

enter image description here

and it have undocumented ANSI CSI SGR numbers like:


Wikipedia say that the numbers are up to 109. What those 234 do? Are those codes documetation somewere?

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up vote 2 down vote accepted

These codes are used for setting 8-bits colors codes in xterm.

The prefix is [38;5; and 243m the color code. That's what is written in Wikipedia :

38 : Set xterm-256 text color

You can find more details in this answer.

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