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.\" ========================================================================
.\"
.IX Title "VNL-UNIQ 1"
.TH VNL-UNIQ 1 2024-02-04 "" vnlog
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.SH NAME
vnl\-uniq \- uniq a log file, preserving the legend
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 9
\& $ cat colors.vnl
\& # color
\& blue
\& yellow
\& yellow
\& blue
\& yellow
\& orange
\& orange
\&
\& $ < colors.vnl | vnl\-sort | vnl\-uniq \-c
\& # count color
\&       2 blue
\&       2 orange
\&       3 yellow
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
.Vb 1
\&  Usage: vnl\-uniq [options] < logfile
.Ve
.PP
This tool runs \f(CW\*(C`uniq\*(C'\fR on a given vnlog dataset. \f(CW\*(C`vnl\-uniq\*(C'\fR is a wrapper around
the GNU coreutils \f(CW\*(C`uniq\*(C'\fR tool. Since this is a wrapper, most commandline
options and behaviors of the \f(CW\*(C`uniq\*(C'\fR tool are present; consult the \fBuniq\fR\|(1)
manpage for detail. The differences from GNU coreutils \f(CW\*(C`uniq\*(C'\fR are
.IP \(bu 4
The input and output to this tool are vnlog files, complete with a legend
.IP \(bu 4
\&\f(CW\*(C`\-\-zero\-terminated\*(C'\fR is not supported because vnlog assumes
newline-separated records
.IP \(bu 4
Only \fIone\fR input is supported (a file on the cmdline or data on standard
input), and the output \fIalways\fR goes to standard output. Specifying the output
as a file on the commandline is not supported.
.IP \(bu 4
\&\f(CW\*(C`\-\-vnl\-count NAME\*(C'\fR can be given to name the \f(CW\*(C`count\*(C'\fR column. \f(CW\*(C`\-c\*(C'\fR is still
supported to add the default new column named \f(CW\*(C`count\*(C'\fR, but if another name is
wanted, \f(CW\*(C`\-\-vnl\-count\*(C'\fR does that. \f(CW\*(C`\-\-vnl\-count\*(C'\fR implies \f(CW\*(C`\-c\*(C'\fR
.IP \(bu 4
In addition to the normal behavior of skipping fields at the start, \f(CW\*(C`\-f\*(C'\fR and
\&\f(CW\*(C`\-\-skip\-fields\*(C'\fR can take a negative argument to skip the \fIall but the last\fR N
fields. For instance, to use only the one last field, pass \f(CW\*(C`\-f \-1\*(C'\fR or
\&\f(CW\*(C`\-\-skip\-fields=\-1\*(C'\fR.
.IP \(bu 4
By default we call the \f(CW\*(C`uniq\*(C'\fR tool to do the actual work. If the underlying
tool has a different name or lives in an odd path, this can be specified by
passing \f(CW\*(C`\-\-vnl\-tool TOOL\*(C'\fR
.PP
Past that, everything \f(CW\*(C`uniq\*(C'\fR does is supported, so see that man page for
detailed documentation.
.SH COMPATIBILITY
.IX Header "COMPATIBILITY"
I use GNU/Linux\-based systems exclusively, but everything has been tested
functional on FreeBSD and OSX in addition to Debian, Ubuntu and CentOS. I can
imagine there's something I missed when testing on non-Linux systems, so please
let me know if you find any issues.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBuniq\fR\|(1)
.SH REPOSITORY
.IX Header "REPOSITORY"
https://github.com/dkogan/vnlog/
.SH AUTHOR
.IX Header "AUTHOR"
Dima Kogan \f(CW\*(C`<dima@secretsauce.net>\*(C'\fR
.SH "LICENSE AND COPYRIGHT"
.IX Header "LICENSE AND COPYRIGHT"
Copyright 2019 Dima Kogan \f(CW\*(C`<dima@secretsauce.net>\*(C'\fR
.PP
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation; either version 2.1 of the License, or (at your option) any
later version.