DCL Verbs, Cont’d

“Foreign” Commands

$ symbol = value

Examples:

$ DIR :== DIRECTORY/SIZE=ALL/DATE

$ ZIP :== $ZIP/VMS

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Commands can be added or customized using symbols or “foreign commands”.

In the slide, the DIR symbol redefines the behavior of the DIRECTORY command, while the ZIP symbol provides a means to invoke the ZIP program in such a manner that it can accept parameters and qualifiers from the command line.