diff

[Daniel Shahaf]

אורי wrote on Tue, 14 Dec 2021 07:44 +00:00:
> Actually I prefer the "<(..)" method, because sometimes I want to compare 2
> commands:
>
> diff <(pip freeze | sort) <(cat requirements.txt | sort)
>

Consider s/diff/comm -12/.

> Or even use cat and echo to add a specific line to one of the outputs. If I
> want the result to be completely null. For example to run in crontab and
> send me mail whether it's not null.

Careful here.  By default, cron jobs run not under your login shell but
under /bin/sh, and it's possible the latter doesn't support «<(…)» even
if the former does.

Cheers,

Daniel


> אורי
> uri at speedy.net
>
>
> On Tue, Dec 14, 2021 at 9:31 AM Eli Marmor <eli at netmask.it> wrote:
>
>> Use "-" instead the file name of one of both of the files, and pipe your
>> output to the diff command.
>>
>> ‪On Tue, 14 Dec 2021 at 09:12, ‫אורי‬‎ <uri at speedy.net> wrote:‬
>>
>>> Thank you.
>>>
>>> אורי
>>> uri at speedy.net
>>> _______________________________________________
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>>> Linux-il at cs.huji.ac.il
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>>>
>>
>
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