Concise Command Language (CCL) was the term used byDigital Equipment Corporation for thecommand-line interpreter /user interface supplied on several of their computing systems; its successor was namedDIGITAL Command Language (DCL).

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

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

ThePDP-6 monitor came with a simple set of commands. To compile and run aFORTRAN 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

(TheDOT is a monitor prompt and theStar/Asterisk is an application prompt)

ThePDP-10 monitor (later calledTOPS-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

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

• Command shells

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