From: Stephane Chazelas <stephane@chazelas.org>
To: Paulo Diovani <paulo@diovani.com>
Cc: zsh-workers@zsh.org
Subject: Re: [Bug] comparisson operator `[[` not working as expected
Date: Mon, 20 Jun 2022 20:54:04 +0100 [thread overview]
Message-ID: <20220620195404.oamvev3ls6qnkpra@chazelas.org> (raw)
In-Reply-To: <CABdM12-XmzJNFECJto8hR0YROQOuq71p20Hb9jVAx6YNyF2RDg@mail.gmail.com>
2022-06-20 15:32:32 -0300, Paulo Diovani:
[...]
> In version 5.9 the [[ ]] operator is behaving unexpectedly for the
> following case:
>
> $ watch ls &
> $ [ $(jobs -l | wc -l) -gt 0 ] && echo jobs found || echo no jobs
> jobs found
> $ [[ $(jobs -l | wc -l) -gt 0 ]] && echo jobs found || echo no jobs
> no jobs
[...]
While I agree that looks like a bug (the output of jobs seems to
be empty when the command substitution is expanded inside
[[...]] or ((...)) or a[$(jobs)]=... at least in my tests), a
better approach here would be to use:
if (( $#jobstates > 0 )); then
echo jobs found
else
echo no jobs
fi
--
Stephane
next prev parent reply other threads:[~2022-06-20 19:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-20 18:32 Paulo Diovani
2022-06-20 19:54 ` Stephane Chazelas [this message]
2022-06-20 20:07 ` Paulo Diovani
2022-06-20 20:30 ` Bart Schaefer
2022-06-21 0:47 ` Mikael Magnusson
2022-06-21 3:42 ` Bart Schaefer
2023-05-03 18:17 ` Paulo Diovani
2023-05-04 5:38 ` Mikael Magnusson
2023-05-04 13:10 ` Paulo Diovani
2023-05-04 14:56 ` Bart Schaefer
2023-05-04 17:42 ` Paulo Diovani
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