Concise Command Language (CCL) was the term used by Digital Equipment Corporation for the Command-line interpreter / User interface supplied on several of their computing systems; its successor was named DIGITAL Command Language (DCL).

CCL provides the user with an extensive set of terminal commands.^[1]

The first system to include CCL was DEC's PDP-10.^[2]

History

The PDP-6 monitor came with a simple set of commands. To compile and run a FORTRAN program, one would

• .R F4 --- invoke the FORTRAN compiler
• *DTA1:PROG3=DTA2:PROG3,SUB3A,SUB3B --- specify binary output and source input
• .R LOADER 30 --- invoke the loader, allocate 30K of memory
• *DTA1:PROG3 --- specify binary object to load
• *SYS:/S --- let the loader find the appropriate subroutine libraries
• .SAVE DTA1:PROG3 --- write the executable to DTA1

(The DOT is a monitor prompt and the Star/Asterisk is an application prompt)

The PDP-10 had CCL. Key to its improvements over its predecessor were:^[2]

• multi-step commands: .EX PROG3,SUB3A,SUB3B

• would check to see if any of the 3 needed to be recompiled (and did so if necessary)
• run the object program loader (including needed subroutine libraries)
• start running the program

• advanced command file: .EX @RUNPROG3.CMD

• would run the command(s) in the .CMD file

Commands

The following table contains a list of CCL commands.^[1]