/sys$common/syshlp/helplib.hlb SET, COMMAND, Qualifiers, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /OUTPUT[=filespec]
       /NOOUTPUT

    Controls where the modified command table should be placed. If
    you provide an output file specification, the modified command
    table is written to the specified file. If you do not provide an
    output file specification, the edited command table replaces your
    process table. The /NOOUTPUT qualifier indicates that no output
    is to be generated.

    You can specify an output file specification with the /OUTPUT
    qualifier only when you also use the /TABLE=filespec qualifier to
    provide the input tables. The default file type is .EXE.

    You can use the /OUTPUT qualifier only in /DELETE or /REPLACE
    mode; you cannot use the /OUTPUT qualifier in /OBJECT mode.

    In /DELETE and /REPLACE mode, the default is /OUTPUT with no file
    specification.