crontab bash tests

[lejeczek]

On 24/09/2023 18:44, lejeczek via ubuntu-users wrote:
> Hi guys.
>
> I have this
>
> */1 * * * * { [[ $(/usr/bin/sudo -u postgres /usr/bin/psql 
> --quiet --port=5433 -x -c 'select state from 
> pg_stat_replication;' | grep streaming > /dev/null)$? -eq 
> 0 ]] && /usr/bin/touch /tmp/pgSQL-5433.isMaster || rm -f 
> /tmp/pgSQL-5433.isMaster; }
>
> which in regular shell session touches the file, but in 
> the cron file gets removed, the opposite & actually the 
> only outcome, regardless of whether the test is true or false.
> What is going on there?
> many thanks, L.
>
I appreciate all the feedback, I do,  however -- on purpose 
or not --- everybody seems to have ignored my second, 
equally important point.
Whether
if ..
[ ..
[[ ..
and I tried them all, outside of _cron_ the same command 
line, copy&paste, works as expected, tests works as expected.
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