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

XENIX Programming SCCS: Source Code Control System
You may give more than one file name. If you do, the command checks each file in
turn. You may also give the name of a directory, in which case the command checks all
files in the directory.
Since failure to repair a damaged s-file can destroy the file's contents or make the file
inaccessible, it is a good idea to regularly check all s-files for damage.
Editing an s-file
When an s-file is discovered to be damaged, it is a good idea to restore a back-up copy
of the file from a back-up disk or tape rather than attempting to repair the file.
(Restoring a back-up copy of a file is described in the XENIX 286 System
Administrator's Guide.) If this is not possible, the file may be edited using a XENIX text
editor.
To repair a damaged s-file, use the description of an s-file given in the entry sccsfile in
"File Formats" in the XENIX 286 C Library Guide to locate the damaged part of the
file. Use extreme care when making changes; small errors can cause unwanted results.
Changing an s-file's Checksum
After repairing a damaged s-file, you must change the file's checksum using the -z
option of the admin command. For example, to restore the checksum of the repaired
file s.demo.c, type
admin -z s.demo.c
The command computes and saves the new checksum, replacing the old sum.
Regenerating a g-file for Editing
You can create a g-file for editing without affecting the current contents of the p-file
by using the -k option of the get command. The option has the same effect as the -e
option except that the current contents of the p-file remain unchanged. The option is
typically used to regenerate a g-file that has been accidentally removed or destroyed
before it has been saved using the delta command.
Restoring a Damaged p-file
The -g option of the get command may be used to generate a new copy of a p-file that
has been accidentally removed. For example, the command
get -e -g s.demo.c
creates a new p-file entry for the most recent version in s.demo.c. If the file demo.c
already exists, it will not be changed by this command.
5-25