Undoing mv foo.txt{,_}

Undoing mv foo.txt{,_}

[René Wilhelm]

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Hello,

what would be a convenient way to remove specified trailing characters of a
string in ZLE?

For example, when I quickly want to add a suffix to a string/filename, I
usually do

mv file.txt{,_}

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=foo.txt; mv $a $a:r)?

Thanks,
René

Re: Undoing mv foo.txt{,_}

[Lawrence Velázquez]

> On Sep 6, 2016, at 1:04 PM, René Wilhelm <rene.wilhelm@gmail.com> wrote:
> 
> For example, when I quickly want to add a suffix to a string/filename, I
> usually do
> 
> mv file.txt{,_}
> 
> What's a good way to move file.txt_ back to file.txt

mv file.txt{_,}    ...?

vq

Re: Undoing mv foo.txt{,_}

[René Wilhelm]

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​​
That's it! So obvious, thank you.

On 6 September 2016 at 19:17, Lawrence Velázquez <vq@larryv.me> wrote:

> > On Sep 6, 2016, at 1:04 PM, René Wilhelm <rene.wilhelm@gmail.com> wrote:
> >
> > For example, when I quickly want to add a suffix to a string/filename, I
> > usually do
> >
> > mv file.txt{,_}
> >
> > What's a good way to move file.txt_ back to file.txt
>
> mv file.txt{_,}    ...?
>
> vq
>

Re: Undoing mv foo.txt{,_}

[Vincent Bernat]

 ❦  6 septembre 2016 19:04 CEST, René Wilhelm <rene.wilhelm@gmail.com> :

> 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=foo.txt; mv $a $a:r)?

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

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