rhmask - generates and recovers file masks
SYNOPSIS
rhmask <infile> <maskfile>
rhmask -d <infile> <outfile> <maskfile>
DESCRIPTION
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 pack
age. The rhmask utility uses a simple XOR scheme for cre
ating 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.
OPTIONS
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 cur
rent 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 operation
is successful, no output is produced.
SEE ALSO
md5sum(1)
AUTHOR
Erik Troan <ewt@redhat.com>
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