VMS Help  —  SET  FILE  Qualifiers  /ENTER
       /ENTER=new-filespec

    The new-filespec parameter is used to create either an alias or
    a hard link for the file specified in the SET FILE command. For
    detailed information about using hard links and aliases, see the
    VSI OpenVMS System Manager's Manual.

    Normally you would use /ENTER to create an alias or a hard link
    in a directory different from the one where the original filename
    resides. If the names are not in different directories, you or
    another user could subsequently lose data during a delete or
    purge operation. The DELETE and PURGE commands and the file
    version limit feature can behave unpredictably if the original
    name and the new name are in the same directory.

    To remove an alias or hard link, use the SET FILE /REMOVE
    command. Exercise caution when using the DELETE and SET FILE
    /REMOVE commands, or you could end up with either an inaccessible
    file that has no name or a name that does not refer to a file.
    Follow these guidelines to avoid such problems:

    o  Use SET FILE /REMOVE to remove an alias; do not use the DELETE
       command to remove an alias.

    o  Do not use SET FILE /REMOVE to remove the original file name.

    If you do not follow these guidelines and encounter problems, use
    ANALYZE /DISK /REPAIR to move inaccessible files to the SYSLOST
    directory and remove names that no longer refer to files.
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