TShark is a terminal oriented version of Wireshark designed for capturing and
displaying packets when an interactive user interface isn’t necessary or
available. It supports the same options as wireshark. For more information on
tshark consult your local manual page (man tshark) or
the online version.
Help information available from tshark.
TShark (Wireshark) 4.5.0 (v4.5.0rc0-1147-g31b31e100870)
Dump and analyze network traffic.
See https://www.wireshark.org for more information.
Usage: tshark [options] ...
Capture interface:
-i <interface>, --interface <interface>
name or idx of interface (def: first non-loopback)
-f <capture filter> packet filter in libpcap filter syntax
-s <snaplen>, --snapshot-length <snaplen>
packet snapshot length (def: appropriate maximum)
-p, --no-promiscuous-mode
don't capture in promiscuous mode
-I, --monitor-mode capture in monitor mode, if available
-B <buffer size>, --buffer-size <buffer size>
size of kernel buffer in MiB (def: 2MiB)
-y <link type>, --linktype <link type>
link layer type (def: first appropriate)
--time-stamp-type <type> timestamp method for interface
-D, --list-interfaces print list of interfaces and exit
-L, --list-data-link-types
print list of link-layer types of iface and exit
--list-time-stamp-types print list of timestamp types for iface and exit
Capture display:
--update-interval interval between updates with new packets, in milliseconds (def: 100ms)
Capture stop conditions:
-c <packet count> stop after n packets (def: infinite)
-a <autostop cond.> ..., --autostop <autostop cond.> ...
duration:NUM - stop after NUM seconds
filesize:NUM - stop this file after NUM KB
files:NUM - stop after NUM files
packets:NUM - stop after NUM packets
Capture output:
-b <ringbuffer opt.> ..., --ring-buffer <ringbuffer opt.>
duration:NUM - switch to next file after NUM secs
filesize:NUM - switch to next file after NUM KB
files:NUM - ringbuffer: replace after NUM files
packets:NUM - switch to next file after NUM packets
interval:NUM - switch to next file when the time is
an exact multiple of NUM secs
printname:FILE - print filename to FILE when written
(can use 'stdout' or 'stderr')
Input file:
-r <infile>, --read-file <infile>
set the filename to read from (or '-' for stdin)
Processing:
-2 perform a two-pass analysis
-M <packet count> perform session auto reset
-R <read filter>, --read-filter <read filter>
packet Read filter in Wireshark display filter syntax
(requires -2)
-Y <display filter>, --display-filter <display filter>
packet displaY filter in Wireshark display filter
syntax
-n disable all name resolutions (def: "mNd" enabled, or
as set in preferences)
-N <name resolve flags> enable specific name resolution(s): "mtndsNvg"
-d <layer_type>==<selector>,<decode_as_protocol> ...
"Decode As", see the man page for details
Example: tcp.port==8888,http
-H <hosts file> read a list of entries from a hosts file, which will
then be written to a capture file. (Implies -W n)
--enable-protocol <proto_name>
enable dissection of proto_name
--disable-protocol <proto_name>
disable dissection of proto_name
--only-protocols <protocols>
Only enable dissection of these protocols, comma
separated. Disable everything else
--disable-all-protocols
Disable dissection of all protocols
--enable-heuristic <short_name>
enable dissection of heuristic protocol
--disable-heuristic <short_name>
disable dissection of heuristic protocol
Output:
-w <outfile|-> write packets to a pcapng-format file named "outfile"
(or '-' for stdout). If the output filename has the
.gz extension, it will be compressed to a gzip archive
--capture-comment <comment>
add a capture file comment, if supported
-C <config profile> start with specified configuration profile
--global-profile use the global profile instead of personal profile
-F <output file type> set the output file type; default is pcapng.
an empty "-F" option will list the file types
-V add output of packet tree (Packet Details)
-O <protocols> Only show packet details of these protocols, comma
separated
-P, --print print packet summary even when writing to a file
-S <separator> the line separator to print between packets
-x add output of hex and ASCII dump (Packet Bytes)
--hexdump <hexoption> add hexdump, set options for data source and ASCII dump
all dump all data sources (-x default)
frames dump only frame data source
ascii include ASCII dump text (-x default)
delimit delimit ASCII dump text with '|' characters
noascii exclude ASCII dump text
help display help for --hexdump and exit
-T pdml|ps|psml|json|jsonraw|ek|tabs|text|fields|?
format of text output (def: text)
-j <protocolfilter> protocols layers filter if -T ek|pdml|json selected
(e.g. "ip ip.flags text", filter does not expand child
nodes, unless child is specified also in the filter)
-J <protocolfilter> top level protocol filter if -T ek|pdml|json selected
(e.g. "http tcp", filter which expands all child nodes)
-e <field> field to print if -Tfields selected (e.g. tcp.port,
_ws.col.info)
this option can be repeated to print multiple fields
-E<fieldsoption>=<value> set options for output when -Tfields selected:
bom=y|n print a UTF-8 BOM
header=y|n switch headers on and off
separator=/t|/s|<char> select tab, space, printable character as separator
occurrence=f|l|a print first, last or all occurrences of each field
aggregator=,|/s|<char> select comma, space, printable character as
aggregator
quote=d|s|n select double, single, no quotes for values
-t (a|ad|adoy|d|dd|e|r|u|ud|udoy)[.[N]]|.[N]
output format of time stamps (def: r: rel. to first)
-u s|hms output format of seconds (def: s: seconds)
-l flush standard output after each packet
(implies --update-interval 0)
-q be more quiet on stdout (e.g. when using statistics)
-Q only log true errors to stderr (quieter than -q)
-g enable group read access on the output file(s)
-W n Save extra information in the file, if supported.
n = write network address resolution information
-X <key>:<value> eXtension options, see the man page for details
-U tap_name PDUs export mode, see the man page for details
-z <statistics> various statistics, see the man page for details
--export-objects <protocol>,<destdir>
save exported objects for a protocol to a directory
named "destdir"
--export-tls-session-keys <keyfile>
export TLS Session Keys to a file named "keyfile"
--color color output text similarly to the Wireshark GUI,
requires a terminal with 24-bit color support
Also supplies color attributes to pdml and psml formats
(Note that attributes are nonstandard)
--no-duplicate-keys If -T json is specified, merge duplicate keys in an object
into a single key with as value a json array containing all
values
--elastic-mapping-filter <protocols> If -G elastic-mapping is specified, put only the
specified protocols within the mapping file
--temp-dir <directory> write temporary files to this directory
(default: /tmp)
--compress <type> compress the output file using the type compression format
Diagnostic output:
--log-level <level> sets the active log level ("critical", "warning", etc.)
--log-fatal <level> sets level to abort the program ("critical" or "warning")
--log-domains <[!]list> comma-separated list of the active log domains
--log-fatal-domains <list>
list of domains that cause the program to abort
--log-debug <[!]list> list of domains with "debug" level
--log-noisy <[!]list> list of domains with "noisy" level
--log-file <path> file to output messages to (in addition to stderr)
Miscellaneous:
-h, --help display this help and exit
-v, --version display version info and exit
-o <name>:<value> ... override preference setting
-K <keytab> keytab file to use for kerberos decryption
-G [report] dump one of several available reports and exit
default report="fields"
use "-G help" for more help
Dumpcap can benefit from an enabled BPF JIT compiler if available.
You might want to enable it by executing:
"echo 1 > /proc/sys/net/core/bpf_jit_enable"
Note that this can make your system less secure!