NAME

       parallel-sums - Calculate checksums in parallel using multiple algorithms

SYNOPSIS

       parallel-sums --algo1 ALGO1FILE [--algo2 ALGO2FILE ... --algoN ALGONFILE] file1 [file2 ... fileN

       parallel-sums --help

DESCRIPTION

       parallel-sums  is  designed  to  make  it  faster  and  easier  to  create  checksum files using multiple
       algorithms. It will only read the data from each input file once, spawning  a  new  thread  per  checksum
       algorithm requested and running calculations in parallel.

       Specify  the  list  of desired checksum algorithms along with the output filename for each checksum type,
       then pass the list of files.

       The output is intended to be 100% compatible with  the  file  formats  of  existing  tools  like  md5sum,
       sha256sum etc.

       --algo ALGOSUMS
              Checksum all input files using the algorithm "algo" and output the checksums in the file ALGOSUMS.

       --help Print usage information and list the checksum algorithms supported.

EXAMPLES

       parallel-sums --md5sum MD5SUMS --sha256sum SHA256SUMS *.iso
              Read all files matching the pattern *.iso. In parallel, checksum each file using the MD5 algorithm
              (writing  to  "MD5SUMS")  and  checksum  each  file  using  the  SHA256  algorithm   (writing   to
              "SHA256SUMS").

SEE ALSO

       md5sum(1), sha1sum(1), sha256sum(1) and sha512sum(1).

COPYRIGHT

       Copyright 2017-2019 Steve McIntyre (steve@einval.com)

       parallel-sums  may  be  copied  under  the  terms  and  conditions of version 2 of the GNU General Public
       License, as published by the Free Software Foundation (Cambridge, MA, USA).

AUTHOR

       Written by Steve McIntyre (steve@einval.com)