Au tour de la France...
Les réactions molles devant le scandale NSA laissaient présager des trucs. On apprendra dans les prochains jours probablement l'étendue des dégâts...

bashrc

voir aussi : http://stackoverflow.com/questions/3503879/assign-output-of-os-system-to-a-variable-and-prevent-it-from-being-displayed-on

et (http://stackoverflow.com/questions/90418/exit-shell-script-based-on-process-exit-code) :
"" After each command, the exit code can be found in the $? variable so you would have something like:

ls -al file.ext
rc=$?
if [[ $rc != 0 ]] ; then
   exit $rc
fi

You need to be careful of piped commands since the $? only gives you the return code of the last element in the pipe so, in the code:

ls -al file.ext | sed 's/^/xx: /"

will not return an error code if the file doesn't exist (since the sed part of the pipeline actually works, returning 0).""