The SCCS (Source Code Control System) command in IBM’s mainframe operating system, z/OS, is used to manage and track changes to source code files. It is a version control system that allows multiple users to work on a codebase simultaneously while providing a way to track and revert changes.

Here are a few examples of how to use the SCCS command:

1. Check out a file for editing:

sccs get file.c

2. Check in a file after editing:

sccs delta file.c

3. Show the history of a file:

sccs prs -l file.c

4. Show the differences between two versions of a file:

sccs diffs -r1.2 file.c

5. Undo changes made to a file:

sccs unget -r1.2 file.c

6. Create a new SCCS file

sccs create file.c

Note that the SCCS command is specific to IBM’s mainframe operating system, z/OS, and may not be available on other operating systems.