From: Alex Satrapa <grail@goldweb.com.au>
To: zzapper <zsh@rayninfo.co.uk>
Cc: Zsh-Users List <zsh-users@zsh.org>
Subject: Re: Can I test if a parameter expansion has worked
Date: Fri, 16 Sep 2022 10:41:18 +1000 [thread overview]
Message-ID: <1EF0D745-0597-4C62-9FA0-4D6BDB8F40FC@goldweb.com.au> (raw)
In-Reply-To: <f93d2561-a8d8-c952-2aeb-8bcf43eef1cb@rayninfo.co.uk>
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On 15 Sep 2022, at 17:34, zzapper <zsh@rayninfo.co.uk> wrote:
>
> I suppose I should be testing the filename before passing it to the expansion
>
> if [[ $f =~ '.jpg|gif|png|jpeg' ]] ;then echo 'ok' ;else echo 'nok' ;fi
That’s how I’d approach it.
Also make sure to check that the new file name doesn’t exist. A common workaround to trying to name a file the same as an existing file is to add a numerical suffix. Then you need to check if there’s already a file/some files with numerical suffixes and figure out what the next suffix needs to be. One example I saw was to start with N=1, then keep incrementing that counter until file_s_${N} doesn’t exist.
Anyway, if you need help overthinking stuff I’ll be around.
Alex
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next prev parent reply other threads:[~2022-09-16 0:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-14 10:03 zzapper
2022-09-14 18:36 ` Bart Schaefer
2022-09-15 0:08 ` Alex Satrapa
2022-09-15 7:34 ` zzapper
2022-09-15 8:24 ` Peter Stephenson
2022-09-15 8:38 ` zzapper
2022-09-15 16:48 ` Bart Schaefer
2022-09-20 7:14 ` david rayner
2022-09-16 0:41 ` Alex Satrapa [this message]
2022-09-20 12:49 ` Stephane Chazelas
2022-09-20 13:25 ` Stephane Chazelas
2022-09-20 13:31 ` Stephane Chazelas
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