Ralph Corderoy <ralph(_at_)inputplus(_dot_)co(_dot_)uk> writes:
Hi David,
$ mhparam folder
-nocreate
$ folder +/this/does/not/exist
$ echo $?
1
I'd expect something on stderr.
Well, the man page doesn't promise that
No, I quite agree. Didn't meant to imply it did.
I think the non-zero exit status is sufficient. Esp. in scripts.
Well, folder(1) is kind of cd and mkdir in one. With -nocreate, I'm
cd-ing to the folder, and cd complains when the directory's missing. I
agree I should notice the lack of "/this/does/not/exist+ has no
messages.", but the Unix norm is silence if all's well so I've been
conditioned. My following commands, in the wrong folder, can wreak
havoc. :-)
I am hardly an expert bash programmer, but
I customarily begin all my bash scripts with
set -eu
So if an error does occur I may not know the cause but havoc will be
less likely wrecked. If want a bit more information I can write something
like:
set -eu
trap "echo >&2 $0: Something is rotten in Denmark" 1 2 3 8
If I want to ignore the error status of a command
I can write
command || true
where true is any command which had no effect and returns no error.
Norman Shapiro
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