Changes made to a checked-out version, which are not yet checked in, are said to be pending. When editing a file, you can find out what your pending changes are using sccs diffs. The diffs subcommand uses diff(1) to compare your working copy with the most recently checked-in version.
$ sccs diffs program.c ------ program.c ------ 37c37 < if (((cmd_p - cmd) + 1) == l_lim) { --- > if (((cmd_p - cmd) - 1) == l_lim) {
Most of the options to diff can be used. To invoke the -c option to diff, use the -C argument to sccs diffs.