/sys$common/syshlp/helplib.hlb CMS, DELETE, HISTORY, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    CMS> DELETE HISTORY/BEFORE=TODAY "old history in HISTORY.DMP"
    Confirm DELETE HISTORY/BEFORE=10-MAY-1988 [Y/N] (N): y
    %CMS-S-HISTDEL, 89 history records deleted

      This example deletes all of the library history prior to
      the current day. The following shows the first few records
      contained in the HISTORY.DMP file:

          Deleted dump for CMS Library DISKX:[PROJECT.CMSLIB]

            6-MAR-1988 17:07:50 SNAKE  CREATE ELEMENT OUTPUT.FOR
                  "ASCII format"
            6-MAR-1988 17:26:10 MARTIN CREATE ELEMENT INIT.FOR
                  "init routines"
            8-MAR-1988 12:33:09 LISA   RESERVE INIT.FOR(1) "change
                  header offset"
            9-MAR-1988 17:34:04 LISA   REPLACE INIT.FOR(2) "header
                  offset and additional free space added"
              .
              .
              .

      The CREATE LIBRARY transaction is not deleted from the library
      history.