Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.TH IFSTAT 8 "28 Oct 2015" "iproute2" "Linux"
+.SH NAME
+ifstat \- handy utility to read network interface statistics
+.SH SYNOPSIS
+.in +8
+.ti -8
+.BR ifstat " [ "
+.IR OPTIONS " ] [ " INTERFACE_LIST " ]"
+
+.ti -8
+.IR INTERFACE_LIST " := " INTERFACE_LIST " | " interface
+.SH DESCRIPTION
+\fBifstat\fP neatly prints out network interface statistics.
+The utility keeps records of the previous data displayed in history files and
+by default only shows difference between the last and the current call.
+Location of the history files defaults to /tmp/.ifstat.u$UID but may be
+overridden with the IFSTAT_HISTORY environment variable. Similarly, the default
+location for xstat (extended stats) is /tmp/.<xstat name>_ifstat.u$UID.
+.SH OPTIONS
+.TP
+.B \-h, \-\-help
+Show summary of options.
+.TP
+.B \-V, \-\-version
+Show version of program.
+.TP
+.B \-a, \-\-ignore
+Ignore the history file.
+.TP
+.B \-d, \-\-scan=SECS
+Sample statistics every SECS second.
+.TP
+.B \-e, \-\-errors
+Show errors.
+.TP
+.B \-n, \-\-nooutput
+Don't display any output.  Update the history file only.
+.TP
+.B \-r, \-\-reset
+Reset history.
+.TP
+.B \-s, \-\-noupdate
+Don't update the history file.
+.TP
+.B \-t, \-\-interval=SECS
+Report average over the last SECS seconds.
+.TP
+.B \-z, \-\-zeros
+Show entries with zero activity.
+.TP
+.B \-j, \-\-json
+Display results in JSON format
+.TP
+.B \-p, \-\-pretty
+If combined with
+.BR \-\-json ,
+pretty print the output.
+.TP
+.B \-x, \-\-extended=TYPE
+Show extended stats of TYPE. Supported types are:
+
+.in +8
+.B cpu_hits
+- Counts only packets that went via the CPU.
+.in -8
+
+.SH ENVIRONMENT
+.TP
+.B IFSTAT_HISTORY
+If set, it's value is interpreted as alternate history file path.
+.SH SEE ALSO
+.BR ip (8)
+.br
+.SH AUTHOR
+ifstat was written by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>.
+.PP
+This manual page was written by Petr Sabata <contyk@redhat.com>.