cache program to compare two files

Vitaliy's answer pointed you to a classmethod that does the job. Sounds like maybe you're not sure how to invoke classmethods in Caché ObjectScript, so here's a transcript from a quick test run I did in Terminal:

USER>set bSame=##class(%Library.File).Compare("c:\s\junk.txt","c:\s\junk2.txt")
 
USER>write bSame
0
USER>set bSame=##class(%Library.File).Compare("c:\s\junk.txt","c:\s\junk.txt")
 
USER>write bSame
1
USER>w $zv
Cache for Windows (x86-64) 2017.1.1 (Build 111U) Wed May 17 2017 15:34:56 EDT
USER>

If Vitaliy's answer meets your needs please set the checkmark alonngside its title line.