RHMASK(8)                                                            RHMASK(8)


       rhmask - generates and recovers file masks


       rhmask <infile> <maskfile>
       rhmask -d <infile> <outfile> <maskfile>


       The  rhmask utility creates mask files from original and updated files.
       The mask files, which may be the latest new versions of  software,  can
       then  be  freely distributed on public Internet servers. The mask files
       are only useful for people who already have  a  copy  of  the  original
       package.   The rhmask utility uses a simple XOR scheme for creating the
       file mask and uses file size and md5 sums to ensure  the  integrity  of
       the result.

       There  are  three files involved in this process. The first is the file
       which both parties must have, which is referred to as the infile.   The
       file  which  the  user would like to end up with is the outfile and the
       mask generated between the two is the maskfile.


       There are two ways of running rhmask. Most users will only  use  it  to
       recover the original file by giving the path to the infile as the first
       argument and the maskfile as the second argument. The outfile  will  be
       generated in the current directory and checked for correctness.

       To  generate  the masks, the other form of rhmask must be used instead.
       The first parameter, -d indicates that you are generating a delta.  The
       next  parameter  is  the  infile which is followed by the outfile.  The
       final parameter is the file name to store the maskfile in. If the oper-
       ation is successful, no output is produced.




       Erik Troan <ewt@redhat.com>

4th Berkeley Distribution       Wed Mar 18 2001                      RHMASK(8)

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