Also, you don't actually need a "true" binary for a shell of any reasonable vintage: # which true /usr/bin/which: no true in (/usr/local/sbin:/usr/local/bi

Also, you don't actually need a "true" binary for a shell of any reasonable vintage: # which true /usr/bin/which: no true in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin) # true; echo $? 0