REORDERCAP(1) REORDERCAP(1)
NAME
reordercap - Reorder input file by timestamp into output file
SYNOPSIS
reordercap [ -n ] <infile> <outfile>
reordercap -h|--help
reordercap -v|--version
DESCRIPTION
Reordercap is a program that reads an input capture file and rewrites
the frames to an output capture file, but with the frames sorted by
increasing timestamp.
This functionality may be useful when capture files have been created by
combining frames from more than one well-synchronised source, but the
frames have not been combined in strict time order.
Reordercap writes the output capture file in the same format as the
input capture file.
Reordercap is able to detect, read and write the same capture files that
are supported by Wireshark. The input file doesn’t need a specific
filename extension; the file format and an optional gzip, zstd or lz4
compression will be automatically detected. Near the beginning of the
DESCRIPTION section of wireshark(1) or
https://www.wireshark.org/docs/man-pages/wireshark.html is a detailed
description of the way Wireshark handles this, which is the same way
reordercap handles this.
OPTIONS
-h|--help
Print the version number and options and exit.
-n
When the -n option is used, reordercap will not write out the output
file if it finds that the input file is already in order.
-v|--version
Print the full version information and exit.
DIAGNOSTIC OPTIONS
--log-level <level>
Set the active log level. Supported levels in lowest to highest
order are "noisy", "debug", "info", "message", "warning",
"critical", and "error". Messages at each level and higher will be
printed, for example "warning" prints "warning", "critical", and
"error" messages and "noisy" prints all messages. Levels are case
insensitive.
--log-fatal <level>
Abort the program if any messages are logged at the specified level
or higher. For example, "warning" aborts on any "warning",
"critical", or "error" messages.
--log-domains <list>
Only print messages for the specified log domains, e.g.
"GUI,Epan,sshdump". List of domains must be comma-separated. Can be
negated with "!" as the first character (inverts the match).
--log-debug <list>
Force the specified domains to log at the "debug" level. List of
domains must be comma-separated. Can be negated with "!" as the
first character (inverts the match).
--log-noisy <list>
Force the specified domains to log at the "noisy" level. List of
domains must be comma-separated. Can be negated with "!" as the
first character (inverts the match).
--log-fatal-domains <list>
Abort the program if any messages are logged for the specified log
domains. List of domains must be comma-separated.
--log-file <path>
Write log messages and stderr output to the specified file.
SEE ALSO
pcap(3), wireshark(1), tshark(1), dumpcap(1), editcap(1), mergecap(1),
text2pcap(1), pcap-filter(7) or tcpdump(8)
NOTES
This is the manual page for Reordercap 4.4.7. Reordercap is part of the
Wireshark distribution. The latest version of Wireshark can be found at
https://www.wireshark.org.
It may make sense to move this functionality into editcap, or perhaps
mergecap, in which case reordercap could be retired.
HTML versions of the Wireshark project man pages are available at
https://www.wireshark.org/docs/man-pages.
AUTHORS
Original Author
Martin Mathieson <martin.r.mathieson[AT]googlemail.com>
2025-06-10 REORDERCAP(1)
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