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tartley/exitval in ps1

Created July 10, 2012 14:22
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prepend a red 'last command exit value' to PS1, only for non-zero values.
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exitval in ps1
# display red exit value if it isn't zero
PROMPT_COMMAND='EXITVAL=$?; '$PROMPT_COMMAND
GET_EXITVAL='$(if [[ $EXITVAL != 0 ]]; then echo -n "\[\e[37;41;01m\] $EXITVAL \[\e[0m\] "; fi)'
export PS1="$GET_EXITVAL$PS1"
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