Example of a File Difference List

$ cvs diff -c -r1.12 -r1.13 basesrc/bin/cat/cat.c
Index: basesrc/bin/cat/cat.c
===================================================================
RCS file: /cvsroot/basesrc/bin/cat/cat.c,v
retrieving revision 1.12
retrieving revision 1.13
diff -c -r1.12 -r1.13
[...]
***************
*** 136,141 ****
--- 136,142 ----
                                fp = stdin;
                        else if ((fp = fopen(*argv, "r")) == NULL) {
                                warn("%s", *argv);
+                               rval = 1;
                                ++argv;
                                continue;
                        }