Dunno how this fits on the elegant scale:
set X=1
if ( `echo $X | grep -P '^\d+$'` != "" ) then
echo $X is a number
else
echo $X is a not a number
endif
-Steve
On Thu, 2005-07-14 at 19:26 +0100, Will McDonald wrote:
> There's probably a more elegant way but you could echo it to grep and
> test the return value?
>
>
> [wmcdonald@willspc ~]$ set numval=13
> [wmcdonald@willspc ~]$ echo $numval
> 13
> [wmcdonald@willspc ~]$ echo $numval | egrep
> '[:alpha:]|[:cntrl:]|[:graph:]|[:punct:]'
> [wmcdonald@willspc ~]$ echo $?
> 1
> [wmcdonald@willspc ~]$ echo $shell
> /bin/tcsh
> [wmcdonald@willspc ~]$
>
> Wrap that in some shell logic and you should be sorted. I don't really
> do csh but in sh/ksh/bash you could do something like...
>
> if (echo $variable | egrep '[:alpha:]|[:cntrl:]|[:graph:]|[:punct:]')
> then
> # variable's not numeric
> echo "Variable $variable is NOT numeric"
> else
> # It's numeric (or null, you'll need to test for that too)
> echo "Variable $variable is numeric."
> fi
>
> Will.
>
> On 14/07/05, Christopher L Judd <clj2289@xxxxxxxxxxxxxxxxxxx> wrote:
> > Would anyone know how to determine if a variable in the csh shell is
> > numeric or string?
> >
> > Thanks,
> > Chris
> >
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