brace expansion question

brace expansion question

[grover mitchell]

I have a file that contains a list like so:

foo1{01..10}
bar2{01..10}

Is there any way to have zsh do a brace expansion on the contents of this file?

Thanks!

Re: brace expansion question

[Eric Mangold]

> I have a file that contains a list like so:
>
> foo1{01..10}
> bar2{01..10}
>
> Is there any way to have zsh do a brace expansion on the contents of this
> file?
>
> Thanks!
>

This is kind of a lame way to do it. Hopefully someone has something
better :)

for word in `cat file`; eval echo $word

I guess you can adapt that to your needs.

Unfortunately, I don't see a parameter expansion flag that performs brace
expansion on the result. It seems like there ought to be one.

Perhaps the "e" flag should also do brace expansion in addition to the
other types of expansion it does. Hmm, there is probably a good reason it
doesn't.

Re: brace expansion question

[DervishD]

    Hi Eric and Grover :)

 * Eric Mangold <teratorn@world-net.net> dixit:
> > foo1{01..10}
> > bar2{01..10}
> >
> > Is there any way to have zsh do a brace expansion on the contents of this
> > file?
> This is kind of a lame way to do it. Hopefully someone has something
> better :)
> 
> for word in `cat file`; eval echo $word

    I don't find it lame, but since the file can be quite large, that
expansion could result in a very long command line. Maybe this is
better (untested!!!):

    cat file | while read line ; eval print $line

> Unfortunately, I don't see a parameter expansion flag that performs brace
> expansion on the result. It seems like there ought to be one.

    I don't remember right now :(

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736
http://www.dervishd.net & http://www.pleyades.net/
It's my PC and I'll cry if I want to...

Re: brace expansion question

[Mariusz Gniazdowski]

Day Wed, Apr 13, 2005 at 10:03:15AM +0200, DervishD:
>     cat file | while read line ; eval print $line

It can be done without cat:
{ while read line ; eval print $line } < file

-- 
Mariusz Gniazdowski

----------------------------------------------------------------------
Startuj z INTERIA.PL! >>> http://link.interia.pl/f186c 

Re: brace expansion question

[Bart Schaefer]

On Apr 12,  6:13pm, grover mitchell wrote:
} 
} foo1{01..10}
} bar2{01..10}
} 
} Is there any way to have zsh do a brace expansion on the contents of
} this file?

On Apr 13,  2:20pm, Eric Mangold wrote:
}
} Unfortunately, I don't see a parameter expansion flag that performs
} brace expansion on the result. It seems like there ought to be one.

Paramter expansion happens before brace expansion in normal evaluation
order, so it'd be sufficient if the tilde flag made braces eligible for
interpretation as it does with glob metacharacters.  The reason it does
not is mostly historical, but also for compatibility bash.  (I notice
that tcsh expands braces that result from parameter expansion.)

} Perhaps the "e" flag should also do brace expansion [...] there is
} probably a good reason it doesn't.

The operations enabled by (e) all have the same evaluation order as
parameter expansion (that is, they're done left to right as the parser
encounters them).

On Apr 13,  1:18pm, Mariusz Gniazdowski wrote:
} Subject: Re: brace expansion question
}
} Day Wed, Apr 13, 2005 at 10:03:15AM +0200, DervishD:
} >     cat file | while read line ; eval print $line
} 
} It can be done without cat:
} { while read line ; eval print $line } < file

Or even

  while read line; do eval print $line; done < file

(which doesn't require the SHORT_LOOPS setopt).