Re: Better ( rm foo; bar > foo ) < foo ?

[nirva@ishiboo.com (Danny Dulai)]

On 12/03/00, Hannu Koivisto said:
>Greetings,
>
>If I needed to, say, modify some file with sed in a script, I'd
>probably write something like this:
>
>TMPFILE=$(mktemp "$(dirname "$FILE")/XXXXXX") || exit 1
>sed 's/foo/bar/g' < "$FILE" > "$TMPFILE" || { rm -f "$TMPFILE" ; exit 1 }
>mv "$TMPFILE" "$FILE"
>
>This is quite clumsy (even if I removed some of the safety) and
>thus the trick shown on the subject is quite appealing especially
>in interactive use.  Unfortunately it has the problem that if bar
>fails, the data is lost.  Besides, even it is a bit clumsier than
>I'd like.
>
>So, I started to ponder if zsh could help here.  Unfortunately I
>couldn't come up with any nice "wrapping" of the functionality
>above with a function or other existing zsh features, only a
>thought of whether it would be possible to create some sort of new
>redirection syntax that would do the trick.
>
>What do you think?
>
>-- 
>Hannu
>

% cat foo
one
% mv =(sed 's/one/two/' foo) foo
% cat foo
two

hows that?

-- 
___________________________________________________________________________
Danny Dulai                                           Feet. Pumice. Lotion.
http://www.ishiboo.com/~nirva/                            nirva@ishiboo.com