Oleg Goldshmidt wrote on Mon, Aug 19, 2013 at 17:00:40 +0300:
> Daniel Shahaf <d...@daniel.shahaf.name> writes:
>
> > Sure. It's a zsh-specific syntax for an anonymous function with
> > arguments. In effect it's an anonymous block. For example:
> >
> > % (){ printf "$1\n" 04 } "%s"
> > 04
> > % (){ printf "$1\n" 04 } "%d"
> > 4
> > % (){ printf "$1\n" 04 } "%e"
> > 4.000000e+00
> >
> > In interactive usage I sometimes find myself wanting to run a command
> > several times in a row with one argument changed. When that argument is
> > in the middle of a (potentially multi-line) command, I find it easier to
> > change it between runs by using an ad-hoc anonymous function to move the
> > argument-to-be-changed to the end of the input. Another case where that
> > would be useful is when the argument appears in two places in the
> > command --- using an anonymous function allows changing the argument in
> > just one place rather than two.
>
> In bash, I use fc ("fix command") for this:
>
> $ printf "%s\n" 04
> 04
> $ fc -s %s=%d
> printf "%d\n" 04
> 4
That looks equivalent to ^foo^bar, which both shells support:
# printf %s\n 04
04
# ^%s^%d
4
> $ fc -n -3 -1
>
> or similar to edit the last 3 commnds (with $EDITOR, or use -e)
> and execute them when done editing.
Nice, thanks. The same invocation works in zsh too. I also know of an
extension to edit the *current* command line in $EDITOR:
(zsh)
autoload -U edit-command-line
zle -N edit-command-line
bindkey '^Fc' edit-command-line
(vim)
CTRL-F (controlled by :help 'cedit')
>
We should probably be collecting such tips on a wiki page or something;
on list archives they'll just be lost...
Daniel
_______________________________________________
Linux-il mailing list
Linux-il@cs.huji.ac.il
http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
