Library /sys$common/syshlp/helplib.hlb  —  NCS  Command Qualifiers, /COMPRESS
  /COMPRESS[=(option[,...])]

   Effectively recovers disk space previously  occupied  by  definitions
   that have been deleted from the library by creating a new compressed
   version of the library.    If you do not explicitly specify an input
   library  file  using  the  /LIBRARY  qualifier,  NCS  compresses the
   current  version  of  SYS$LIBRARY:NCS$LIBRARY.NLB.  If  you  do  not
   explicitly  specify  an  output  library  file  using  the   /OUTPUT
   qualifier,     NCS     writes    the    compressed    library     to
   SYS$LIBRARY:NCS$LIBRARY.NLB.

   Options include BLOCKS:n, HISTORY:n, KEEP, KEYSIZE:n, MODULES:n.
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