From: Bart Schaefer <schaefer@brasslantern.com>
To: Andre Pang <ozone@algorithm.com.au>, zsh-users@sunsite.dk
Subject: Re: running a command multiple times on a glob pattern
Date: Thu, 6 Sep 2001 06:41:13 +0000 [thread overview]
Message-ID: <1010906064113.ZM15455@candle.brasslantern.com> (raw)
In-Reply-To: <999739397.219670.15579.nullmailer@bozar.algorithm.com.au>
On Sep 6, 11:23am, Andre Pang wrote:
}
} i'm thinking that it'd be really handy to have some sort of
} shell construct that looks like
}
} tar zxvf {{*.tar.gz}}
}
} which basically expands to
}
} for i in *.tar.gz; do tar zxvf $i; done
There are all sorts of ways to do this. Here's one:
setopt short_loops
alias with='for WITH in'
function call { emulate -L zsh; $* $WITH }
(Pick different words than "call" and "with" if you like.) Now you write
with *.tar.gz; call tar zxvf
The drawback being that it doesn't nest, because there's only one loop
variable. As you can tell, short_loops are pretty terse to begin with;
it's only two more characters to write
for i in *.tar.gz; tar zxvf $i
but do whatever floats your boat. Another possibility is:
function call {
emulate -L zsh
local a=$'\0\1'
a=$argv[(I)$a] # $'...' doesn't work in subscripts
if (( a )); then
local -a cmd args
cmd=($argv[1,a-1])
args=($argv[a+1,-1])
for a in $args; do $cmd $a; done
fi
}
alias -g with=$'\0\1'
(Use a string more unlikely than $'\0\1' if you find it necessary.) Now
you can say
call tar zxvf with *.tar.gz
and if you need to pass "with" as an argument, you just quote it.
zsh% call echo with this "with" that
this
with
that
You can even nest this, though it doesn't work precisely as you might
expect:
zsh% call call echo this and that with those and with some more
this and that those
this and that and
this and that some
this and that those
this and that and
this and that more
I could go on, but I won't.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net
prev parent reply other threads:[~2001-09-06 6:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-06 1:23 Andre Pang
2001-09-06 6:41 ` Bart Schaefer [this message]
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