Testing for non-zero length string in ksh - Red Hat Customer Portal

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Issue

How to check whether the length of the string in the file is zero or non-zero in ksh?
We have a ksh script that runs PROGRAM1 and writes its exit code to a file.
We would like to implement a subsequent operation (PROGARM2) being performed after PROGRAM1 only when the file has some non-zero value which represents the exit code of PROGRAM1.
If the file has zero length value (which means the file is empty), the subsequent operation (PROGRAM2) shouldn't be performed.

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
ksh

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