determine if csh variable is numeric

[Will McDonald]

There's probably a more elegant way but you could echo it to grep and
test the return value?


[wmcdonald at willspc ~]$ set numval=13
[wmcdonald at willspc ~]$ echo $numval
13
[wmcdonald at willspc ~]$ echo $numval | egrep
'[:alpha:]|[:cntrl:]|[:graph:]|[:punct:]'
[wmcdonald at willspc ~]$ echo $?
1
[wmcdonald at willspc ~]$ echo $shell
/bin/tcsh
[wmcdonald at willspc ~]$ 

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 at garnet.acns.fsu.edu> wrote:
> Would anyone know how to determine if a variable in the csh shell is
> numeric or string?
> 
> Thanks,
> Chris
> 
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