Replacing a Delta: sccs fix

Occasionally, a delta is checked in that contains small bugs, such as typographical errors, that need correcting but that do not require entries in the file audit trail. Or, perhaps the comment for a delta is incomplete or in error, even when the text is correct. In either case, you can make additional updates and replace the version log entry for the most recent delta using sccs fix:

$ sccs fix -r 1.2 program.c

This checks out version 1.2 of program.c. When you check the file back in, the current changes replaces delta 1.2 in the history file, and SCCS prompts for a (new) comment. You must supply an SID with -r. Also, the delta that is specified must be a leaf (most recent) delta.

Although the previously-checked-in delta 1.2 is effectively deleted, SCCS retains a record of it, marked as deleted, in the history file.

Before using sccs fix it is a good idea to make a copy of the current version.