/sys$common/syshlp/SYSMANHELP.HLB  —  @  Description
    Use the execute procedure command to execute a command procedure
    containing SYSMAN commands. To execute the command procedure,
    invoke SYSMAN, place the at sign (@) command at the beginning
    of a command line, then specify the file name of the command
    procedure.

    The command procedure can contain any valid SYSMAN command.
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