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From: Vincent Bernat <bernat@luffy.cx>
To: =?utf-8?Q?Ren=C3=A9?= Wilhelm <rene.wilhelm@gmail.com>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: Undoing mv foo.txt{,_}
References: <CA+oFM6KxR2tZygyYzhZynsXzqHOroNc6WeG=QbTZPqTwra+-cw@mail.gmail.com>
Date: Wed, 07 Sep 2016 06:54:15 +0200
In-Reply-To: <CA+oFM6KxR2tZygyYzhZynsXzqHOroNc6WeG=QbTZPqTwra+-cw@mail.gmail.com>
	(=?utf-8?Q?=22Ren=C3=A9?= Wilhelm"'s message of "Tue, 6 Sep 2016 19:04:05
 +0200")
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 =E2=9D=A6  6 septembre 2016 19:04 CEST, Ren=C3=A9 Wilhelm <rene.wilhelm@gm=
ail.com>=C2=A0:

> What's a good way to move file.txt_ back to file.txt, or more general: how
> to remove the suffix of a string, without putting it in a variable first
> (e.g. a=3Dfoo.txt; mv $a $a:r)?

About not using a variable, there is the ${:-...} pattern:

echo ${${:-foo.txt}:r}
--=20
Make sure all variables are initialised before use.
            - The Elements of Programming Style (Kernighan & Plauger)