Intel XENIX 286 Programmers Guide (86) - Tenox.tc

SCCS: Source Code Control System XENIX Programming
Locking a Version
The lock flag, 1, lists by release number all versions in a given s-file that are locked
against further editing. You can set the flag by using the -f flag of the admin command.
The flag must be followed by one or more release numbers. Multiple release numbers
must be separated by commas (,). For example, the command
admin -fl3 s.demo.c
locks all versions with release nu mber 3 against further editing. The command
admin -fl4,5,9 s.def.h
locks all versions with release numbers 4, 5, and 9.
Note that the special symbol "a" may be used to specify all release numbers. The
command
admin -fla s.demo.c
locks all versions in the file s.demo.c.
Repairing sees Files
SCCS carefully maintains all SCCS files, making damage to the files very rare. Damage
can result from hardware malfunctions that cause incorrect information to be copied to
the file. The following sections explain how to check for damage to SCCS files and how
to repair the damage or regenerate the file.
Checking an s-file
You can check a file for damage using the -h option of the admin command. The option
causes the checksum of the given s-file to be computed and compared with the existing
sum. An s-file's checksum is an internal value computed from the sum of all bytes in
the file. If the new and existing checksums are not equal, the command displays the
message
corrupted file (coG)
indicating damage to the file. For example, the command
admin -h s.demo.c
checks the s-file s.demo.c for damage by generating a new checksum for the file and
comparing the new sum with the existing sum.
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