From: "Bart Schaefer" <schaefer@brasslantern.com>
To: Sweth Chandramouli <sweth@astaroth.nit.gwu.edu>,
zsh-users@math.gatech.edu
Subject: Re: globbing for links in pathnames
Date: Thu, 4 Feb 1999 21:07:55 -0800 [thread overview]
Message-ID: <990204210755.ZM20448@candle.brasslantern.com> (raw)
On Feb 4, 11:22pm, Sweth Chandramouli wrote:
} Subject: Re: globbing for links in pathnames
}
} On Thu, Feb 04, 1999 at 04:56:00PM -0800, Bart Schaefer wrote:
} > zsh% setopt globassign
} > zsh% x=*(@) eval 'ls $^x/man(/)'
}
} according to the docs, globassign is deprecated, because
} globbing is done implicitly so long as the parameter is explicitly
} set to an array.
D'oh! I was distracted by attempting to get globbing to happen in the
right-side of ${x::=*(@)}, discovered that glob_assign wouldn't do it,
and then just left it there and typed the other solution.
} so it should end up something like the following:
}
} x=(pkgs/*(@)) ; ls -d ${^x}/man(/)
The reason I used the eval was to avoid having x remain set after the
command completes. `x=(*(@)) eval ...` will unset x again at the end
of the eval, and won't destroy any existing value of x.
zsh% x=START ; x=NEXT eval 'echo $x' ; echo $x
NEXT
START
} -- sweth, who is now wondering if he could combine this
} with the earlier discussion about nested expansion to make a single
} inscrutable argument to ls -d to achieve this via (P).
The new (P) flag won't help with this; it only does an extra level of
variable name lookup.
There's no way to get globbing to happen inside the ${...} expression
without using a command substitution. So you could do
ls -d pkgs/${^$(echo *(@))}/man(/)
but that actually has to fork a subshell for the $(...) so it's not as
efficient as the eval.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
next reply other threads:[~1999-02-05 5:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-02-05 5:07 Bart Schaefer [this message]
-- strict thread matches above, loose matches on Subject: below --
1999-02-05 17:14 Bart Schaefer
1999-02-05 14:24 Andrew Gallagher
1999-02-05 12:06 Phil Pennock
1999-02-05 4:22 Sweth Chandramouli
1999-02-05 4:11 Sweth Chandramouli
1999-02-05 0:56 Bart Schaefer
1999-02-05 0:23 Steve Talley
1999-02-04 23:27 Sweth Chandramouli
1999-02-04 22:36 Steve Talley
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