In most cases, SCCS commands accept two types of parameters:
File or directory names cannot begin with a - (minus sign). If you specify this sign by itself, the command reads standard input or keyboard input until it reaches an end-of-file character. This is useful when using pipes which allow processes to communicate.
Any flags specified for a command apply to all files on the command line and are processed before any other parameters to that command. Flag placement in the command line is not important. Other parameters are processed left to right. Some SCCS files contain flags that determine how certain commands operate on the file. See the admin command description of SCCS header flags for more information.
Source Code Control System (SCCS) Overview.
Using the make Command with Source Code Control System (SCCS) Files.
The sccsfile file format.