1    /AFTER[=directory-specification]

    Instructs CMS to insert new libraries into the existing library
    search list (that you previously specified by using a comma list
    with the CREATE LIBRARY or SET LIBRARY command) immediately
    following the existing specified directory. If you omit the
    directory specification, CMS adds the libraries to the end of
    the list. You cannot specify both /AFTER and /BEFORE on the same
    command line. By default, the SET LIBRARY command's library list
    supersedes any existing search list.

2    /BEFORE[=directory-specification]

    Instructs CMS to insert new libraries into the existing library
    search list (that you previously specified by using a comma list
    with the CREATE LIBRARY or SET LIBRARY command) immediately
    in front of the existing specified directory. If you omit the
    directory specification, CMS adds the libraries to the front of
    the list. You cannot specify both /AFTER and /BEFORE on the same
    command line. By default, the SET LIBRARY command's library list
    supersedes any existing search list.

3    /LOG (D)

    Controls whether CMS displays success and informational messages
    on the default output device. By default, if the command executes
    successfully, CMS displays a success message. If you specify
    /NOLOG, success and informational messages are suppressed. Any
    warning, error, or fatal error messages are displayed regardless
    of whether /LOG or /NOLOG is specified.

4    /VERIFY (D)

    Allows you to set a library without performing the locking and
    verification process CMS normally performs. This speeds up the SET
    LIBRARY operation and allows a CMS library to be set even if the
    library is locked by another user. However, if the library needs
    recovery, the condition is not detected until another transaction
    is attempted.