On Sat, Nov 02, 2002 at 10:51:00PM -0500, Neal Lippman wrote:
>
> 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.
>
The problem here might be the way the expression is scapped:
After the for, x is substituted by $alpha, so the echo $x shows the
content of $alpha. the curly braquets might take preference over the
variable substitution, so it is used as a one item list, $alpha.
Dunno if is POSIXly correct, but it works that way.
Try using:
alpha="a b c d e" with spaces and
for x in $alpha ; do
echo $x
done
Even trying with your idea and using the execution inverted
single-quotes (`) it is taken as a one-element list, with no comas.
HTH
--
Jesus Climent | Unix System Admin | Helsinki, Finland.
web: www.hispalinux.es/~data/ | pumuki.hispalinux.es
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