# meant to be sourced from your bash environment
# this will display a colored error code if the previous function 
# returned an error, or just the regular prompt otherwise.
#
# JPM <jpmartin@cs.utexas.edu>

showIfError ()
{
  AUX=$?;
  if [ $AUX -gt 0 ]; then PREFIX="\[\033[1;33m\][${AUX}] "; else PREFIX=""; fi
  PS1="${PREFIX}\[\033[1;32m\]\w\[\033[0;0m\]\$ ";
}

PROMPT_COMMAND=showIfError