.TH PARALLEL-SUMS 1 "February 2019" "Jigit jigdo tools"
.SH NAME
parallel-sums \- Calculate checksums in parallel using multiple algorithms
.SH SYNOPSIS
.B parallel-sums
\-\-algo1 \fBALGO1FILE\fR
[\-\-algo2 \fBALGO2FILE\fR ... \-\-algoN \fBALGONFILE\fR]
file1 [file2 ... fileN
.PP
.B parallel-sums
\-\-help
.SH DESCRIPTION
.PP
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.
.PP
Specify the list of desired checksum algorithms along with the output
filename for each checksum type, then pass the list of files.
.PP
The output is intended to be 100% compatible with the file formats of
existing tools like md5sum, sha256sum etc.
.TP
\fB\-\-algo ALGOSUMS\fR
Checksum all input files using the algorithm "algo" and output the
checksums in the file ALGOSUMS.
.TP
\fB\-\-help\fR
Print usage information and list the checksum algorithms supported.
.SH "EXAMPLES"
.TP
\fBparallel-sums \-\-md5sum MD5SUMS \-\-sha256sum SHA256SUMS *.iso\fR
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").
.SH "SEE ALSO"
\fBmd5sum\fP(1), \fBsha1sum\fP(1), \fBsha256sum\fP(1) and \fBsha512sum\fP(1).
.SH "COPYRIGHT"
Copyright 2017-2019 Steve McIntyre (steve@einval.com)
.PP
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).
.SH "AUTHOR"
Written by Steve McIntyre (steve@einval.com)