Am Son, 2002-11-03 um 04.51 schrieb Neal Lippman:
> I am trying to solve a bash scripting problem, but I cannot figure it
> out.
>
> I frequently need to execute a command of the form:
> for x in {A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z); do
> <do something with each x> ;
> done
>
> This works fine if I actually type out the entire alphabet list on the
> command line as above, but that's sort of a pain. So, I tried setting a
> shell variable to the alphabet string (export alpha="A,B,C,...,Z"), but
> then the command:
> for x in {$alpha} ;
> do
> echo $x;
> done
> winds up printing the string "{A,B,C,...,Z}" rather than each letter on
> a separate line as expected.
>
> I've tried various versions, including escaping the {} characters, etc,
> using xargs, etc, but I cannot hit upon a sequence that works.
>
> I also tried writing a program that printed the alphabet string to
> stdout, but same results.
>
> Can anyone suggest a syntax that would do the trick here?
Your problem ist the wrong setting of the IFS (man bash, search for IFS)
!#/bin/bash
TARGETS="A B C D E F G H I" #set up list of targets
OLD_IFS="$IFS" #remember old IFS
IFS=" " #set IFS to "space"
for x in $TARGETS
do
something $x
done
IFS="$OLD_IFS" #restore old IFS
That's how i do it all the time. There may be a better way, but it Just
Works (TM)
--
Matthias Hentges
[www.hentges.net] -> PGP + HTML are welcome
ICQ: 97 26 97 4 -> No files, no URLs
My OS: Debian Woody: Geek by Nature, Linux by Choice
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