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by teo_zero
362 days ago
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In bash, it's enough to remember that $? expands to the exit code of the previous command, and $((x)) evaluate x as an integer expression, including the ternary operator x?y:z. For example the following prints the exit code in green if zero, in red otherwise: PS1='\[\e[$(($??31:32))m\]$? \[\e[39m\]'
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