Hello Frank,

That is nice! I added back the logic to suppress output at user will.

BUT the funny thing with this is it does work in bash but not in zsh. :/

e.g.:
~ % which cp
/bin/cp
~ % check4progs foo cp
foo: binary not found
cp: binary not found

This is with unmodfied debian zsh. I guess some "setopt" is missing here?

I attach the tested "check4progs.PATHloop" for ease of further testing.