Mike Frysinger wrote:
[...]
you're thinking one level too deep
simply do:
$(shell your_script_here 2>/dev/null)
-mike
Well, yes, that's what Paul suggested. The problem is that in my
your_script_here script I'll have to do the same to prevent the shell
from complaining about foo if it doesn't exist (such as executing foo
in another subshell). I guess what I'm really looking for is an easy
way to determine whether a command exists and is executable or not.
AFAIK, the only ways to do it are:
-- try to execute it and deal with the shell error message (i.e.,
my original problem)
-- execute it in a subshell, silence its stderr, and use its exit
status to determine whether it exists or not (128) (i.e., use
my "inefficient hack")
-- parse PATH and use test to see if the command exists in any of
the directories (lots of work)
Martin
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