Qualifiers

/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.

/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.

/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.

/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.