Mailinglist Archive: opensuse-programming (84 mails)

["William A. Mahaffey III" <wam@xxxxxxxxxx>]

dries wrote:

> Hello all,, , 
>
> I've made tcsh script that uses a environment variable that can be defined or 
> not, the script works, but if the variable is not defined i get the message
>  'carrotcount: Undefined variable.'
>
> from the example script below . . .
>
> #!/usr/bin/tcsh
> echo $carrotcount
>
> My question is : is there a way to suppress the 'undefined variable' message 
> or can i check wether it is defined (in a tcsh script) . . 
>
> Grtz Dries Pruimboom
>  

man tcsh on my SuSE 8.2 turned up this under the "Variables" section :

   .
   .
   .
   .


The following substitutions can not be modified with `:' modifiers.

      $?name
      ${?name}
              Substitutes the string `1' if name is set, `0' if it is not.


HTH, YMMV, & all that.