A command procedure is a file that holds a sequence of DCL commands to be executed by the system in sequence interactively or as a batch job - essentially a DCL script. Command procedure files have the extension of .COM (this is not required; however, this is the default file type for interactive command procedure execution.
The following is required for OpenVMS command procedures: 1. Every line in a command procedure that is not a data line has to begin with the dollar sign ($):
$ if f$mode() .nes. "INTERACTIVE" then exit
2. Comments begin with an exclamation point (!). Comment lines begin with a dollar sign AND an exclamation point ($!):
$ if count .eq. 5 !Last element $! Return to the previous level
$! This command procedure displays a message based on the current day of the week. $ say := write sys$output $ day = f$cvtime(,,"WEEKDAY") $! show sym day $ say "Hooray, it's ''day'!"