From: zzapper <zsh@rayninfo.co.uk>
To: zsh-users@zsh.org
Subject: Re: Can I test if a parameter expansion has worked
Date: Thu, 15 Sep 2022 08:34:34 +0100 [thread overview]
Message-ID: <f93d2561-a8d8-c952-2aeb-8bcf43eef1cb@rayninfo.co.uk> (raw)
In-Reply-To: <5dc8b935-f234-ca54-0ceb-50cb1da9bc29@rayninfo.co.uk>
On 14/09/2022 11:03, zzapper wrote:
> Hi
>
> Q1) Can I test if a parameter expansion has 'fired'?
>
> other than by testing if input == output
>
Bit embarrassed I didn't provide an example :(
so here it is
# adding a prefix '_s' to an image name
f=stuff.jpg;
print ${f/%(#m).[pjg][npi]e#[gf]/_s$MATCH}
stuff_s.jpg # good this is what i want
# now pass 'bad' input
f=stuff.txt;
print ${f/%(#m).[pjg][npi]e#[gf]/_s$MATCH}
stuff.txt # expansion has obviously left the input unchanged but can I
test for that???
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
next prev parent reply other threads:[~2022-09-15 7:35 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 [this message]
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
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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