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The admin command is used to administer SCCS files -- that is, to create new SCCS files and change the parameters of existing ones. When an SCCS file is created, its parameters are initialized by use of keyletters with admin or are assigned default values if no keyletters are supplied. The same keyletters are used to change the parameters of existing SCCS files.
Two keyletters are used in detecting and correcting corrupted SCCS files (see ``Auditing'').
Newly created SCCS files are given access permission mode 444 (read-only for owner, group and other) and are owned by the effective user. Only a user with write permission in the directory containing the SCCS file may use the admin(1) command on that file.