[GTALUG] Command doesn't work in script but works on command line?

[John Sellens]

On Sat, 2021/11/06 01:32:13PM -0400, Kevin Cozens via talk <talk at gtalug.org> wrote:
| Modify the script to capture all output from the command as it may help you
| determine what may be going wrong when you run the command in a script.
| (e.g. >& messages.txt)

I'll echo Kevin's suggestion, and mention that potentially the output
of "printenv" might be informative, and I think you can capture everything
from a script by using (after the #! line)
    exec >/tmp/output 2>&1
which I think sends all output of all following commands to /tmp/output.

I also try to check the result of commands in scripts and complain e.g.
    alsa_out args ... \
	|| echo 1>&2 "oh not alsa_out failed"
or
    alsa_out args ...
    ret=$?
    if [ $ret -ne 0 ]; then
	echo 1>&2 "alsa_out failed with $ret"

Hope that helps

John