Let’s say you have your unit tests in place, using something not particularly esoteric as Test::More . Good. Now you want something to give some color to your output, so green is Good , red is Bad and you have a quicker feedback. Time ago I wrote a quick shell script to run all the unit tests, interpret the output (in TAP format), print on screen some color output and stop the tests if something fails. The core was: function check_test_result() { red='\e[0;31m' green='\e[0;32m' end='\033[0m' result=`perl $1`; echo "$result" perl -e '{ my $input = join(" ", @ARGV); if ($input =~ /not ok/m) { exit 0; } exit 1; }' $result if [ $? -eq 0 ] then echo -e "$red Not all tests passed. FAILURE$end" exit -1 else echo -e "$green All tests passed. SUCCESS$end" fi } This works as soon as the unit tests fail (printi...