Unlike some other implementations of sccs, cssc tools do not
usually execute each other. This means for example that
does not invoke
get to extract the previous version of the file,
prs doesn't use
get when processing the
There are a small number of exceptions to this rule :-
sccsdriver program can be used to invoke any of the other tools in the suite. See Known Problems, for a discussion of the issues this raises.
deltaprogram runs a program to validate the Modification Request Numbers offered by the user. See Modification Request Numbers.
sccsdiffprogram is a shell script, and invokes
pr, as well as other tools such as
sccsdiffprogram must not be installed set-user-id.
The driver program
sccs takes a number of precautionary steps
if it detects that it is running set-user-id or set-group-id. These
steps are described below, as part of the discussion of each