crontab bash tests

[lejeczek]

On 26/09/2023 08:33, lejeczek via ubuntu-users wrote:
>
>
> 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.
>
>
ough, okey, seems that I was missing:
SHELL=/usr/bin/bash
if I was to expect Ubuntu's _crond_ to behave more like 
defaults in RHEL/Centos.
many thanks, L
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