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doc/help/ModChk

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+modchk -- compare modification dates on pairs of files (EXTERNAL)
+
+syntax:  modchk <pathname1> <pathname2> [-q] [-o] [-n] [-s]
+
+ex:      modchk thisfile thatfile
+         modchk /disk/= /backup/= -o -n
+         modchk =.s = -n
+
+Checks the last-modification dates on a pair of files.  Wildcards 
+are allowed.  If none of -o (older), -n (newer), or -s (same) is 
+given, a message of the form
+
+     <pathname1> <relation> <pathname2>
+
+is displayed.  Relation is "<" (older), "=" (same), or ">" 
+(newer).  If one or more of -o, -n, or -s appears, pathname1 is 
+displayed only if the files satisfy one of the specified 
+conditions.
+
+The second example above displays the names of files on /disk 
+which are older OR newer than the files with the same names on 
+/backup.  The third example above displays the names of ".s" 
+files that have been modified since their corresponding files 
+without the ".s" suffix.  This is useful for insuring that you 
+have not changed an assembly language source file without 
+recompiling it.
+
+If -q (quiet) is given, no complaint is displayed if the second 
+file doesn't exist.