defining classes based on returning results of (shell) commands?

[Robinson Tiemuqinke]

Hi,

 If there are any ways to define groups/classes with
the return results of (shell) commands? Currently
there is a function called ReturnZero can be used to
define classes based on exit code, like explained in
the online reference:

ReturnsZero(command) 
True if the named shell command returns with exit code
zero (success). 

 But what I’d like to have is something like the
following:

 strCmpReturn(identificationString, command)

        True if the named shell command returns with
(exactly) the identificationString(or number).

 If there is already a function like the above? If
not, anyone can suggest another way to workaround it?

Thanks a lot.



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