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

SCCS: Source Code Control System XENIX Programming
Saving a Specific Version
When editing two or more versions of a file, you can direct the delta command to save a
specific version by using the -r option to give the SID of that version. The command has
the form
delta -rSID s. filename
where -rSID gives the SID of the version being saved and s.filename is the s-file to
receive the new version. The SID may be the SID of the version you have just edited, or
the proposed SID for the new version. For example, if you have retrieved version 1.4 for
editing (and no version 1.5 exists), both commands
and
delta -r1.5 s.demo.c
delta -r1.4 s.demo.c
save version 1.5.
Protecting s-files
SCCS uses the normal XENIX system file permissions to protect s-files from changes by
unauthorized users. In addition to the XENIX system protections, SCCS provides two of
its own ways to protect the s-files: the user list and the protection flags. The user list
is a list of login names and group IDs of users allowed to access the s-file and create
new versions of the file. The protection flags are three special s-file flags that define
which versions are currently accessible to otherwise authorized users. The following
sections explain how to set and use the user list and protection flags.
Adding a User to the User List
You can add a user or a group of users to the user list of a given s-file by using the -a
option of the ad min command. The option causes the given name to be added to the
user list. The user list defines who may access and edit the versions in the s-file. The
command has the form
admin -aname s. filename
where -aname gives the login name of the user or the group name of a group of users to
be added to the list, and s.filename gives the name of the s-file to receive the new
users. For example, the command
admin -ajohnd -asuex -amarketing s.demo.c
adds the users "johnd" and "suex" and the group "marketing" to the user list of the s-file
s.demo.c.
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