Make sure that no-one has checked out a copy of the revision you outdate. Strange things will happen if he starts to edit it and tries to check it back in. Set the state attribute of the revision rev to state . If rev is a branch number, assume the latest revision on that branch. If rev is omitted, assume the latest revision on the default branch.
Any identifier is acceptable for state .
Write descriptive text from the contents of the named file into the RCS file, deleting the existing text. Write descriptive text from the string into the RCS file, deleting the existing text. Set locking to non-strict. Non-strict locking means that the owner of a file need not lock a revision for checkin. Unlock the revision with number rev .