Hide

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

OpenID
or
Sign in Register

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Hide

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

Hide

News

2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.
Hide

Tags

Hide

Functions

Hide

Credits

Site by David Winterbottom (user root).

Commands tagged Network

Commands tagged Network from sorted by
Terminal - Commands tagged Network - 103 results
ifdata -pN eth0
2013-04-12 15:05:36
User: unixmonkey45290
Tags: Network IP network card
-2
Up
Down
Get the IP address of a machine

No junk, no pipe, one command, no subcommand - KISS

Show sample output | Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ifconfig -a | awk '/Bcast/{print $2}' | cut -c 5-19
2013-04-10 14:18:47
User: BigCow
Functions: awk cut ifconfig
Tags: Network IP network card
-2
Up
Down
Get the IP address of a machine. Just the IP, no junk.
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ifconfig -a | awk '/Bcast/{print $2}' | cut -c 5-19
2013-04-10 14:18:25
User: BigCow
Functions: awk cut ifconfig
Tags: Network IP network card
-1
Up
Down
Get the IP address of a machine. Just the IP, no junk.
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ip -o -4 addr show | awk -F '[ /]+' '/global/ {print $4}'
2013-04-09 16:34:39
User: atoponce
Functions: awk
Tags: Network IP network card
1
Up
Down
Get the IP address of a machine. Just the IP, no junk.

Why use many different utilities all piped together, when you only need two?

Show sample output | Comments (3) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl http://ipecho.net/plain
2013-02-20 14:14:19
User: maxwelleite
Tags: Network curl ip address
-3
Up
Down
Get your external IP address

Another simple way to get external IP or use:

wget -qO- http://ipecho.net/plain

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sudo nethogs eth0
2013-01-25 08:20:44
User: totti
Functions: sudo
Tags: Network process bandwidth
5
Up
Down
network usage per process

Nethogs groups bandwidth by process.

Show sample output | Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
ifconfig eth0 | grep HW | cut -d " " -f 11
2012-12-04 10:18:22
User: davidnamy
Functions: cut grep ifconfig
Tags: Network ifconfig grep cut
0
Up
Down
extraer la MAC del comando ifconfig
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
remserial -d -p 23000 -s "115200 raw" /dev/ttyS0 &
2012-11-19 17:56:02
User: phattmatt
Tags: Network ssh serial ssh tunnel
1
Up
Down
Remote Serial connection redirected over network using SSH

Requires software found at: http://lpccomp.bc.ca/remserial/

Remote [A] (with physical serial port connected to device)

./remserial -d -p 23000 -s "115200 raw" /dev/ttyS0 &

Local [B] (running the program that needs to connect to serial device)

Create a SSH tunnel to the remote server:

ssh -N -L 23000:localhost:23000 user@hostwithphysicalserialport

Use the locally tunnelled port to connect the local virtual serial port to the remote real physical port:

./remserial -d -r localhost -p 23000 -l /dev/remser1 /dev/ptmx &

Example: Running minicom on machine B using serial /dev/remser1 will actually connect you to whatever device is plugged into machine A's serial port /dev/ttyS0.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
telnet 0 <port>
2012-11-16 03:38:49
User: somaddict
Functions: telnet
Tags: Network ssh bash ping shell shortcut telnet var networking speed loopback
0
Up
Down
Test against loopback address with the 0.0.0.0 default route.

Super fast way to ftp/telnet/netcat/ssh/ping your loopback address for testing. The default route 0.0.0.0 is simply reduced to 0.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sudo tc qdisc add dev lo root netem delay 500ms
2012-11-05 05:29:51
User: caiosba
Functions: sudo
Tags: Network delay tc
7
Up
Down
Simulate slow network connection locally

Replace 500ms by the desired delay.

To remove it: sudo tc qdisc del dev lo root netem delay 500ms

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
echo foo | ncat [ip address] [port]
2012-10-26 10:53:47
User: dragonauta
Functions: echo
Tags: Network udp tcp icmp protocol socket
-1
Up
Down
send echo to socket network

you can use a pair of commands to test firewalls.

1st launch this command at destination machine

ncat -l [-u] [port] | cat

then use this command at source machine to test remote port

echo foo | ncat [-u] [ip address] [port]

First command will listen at specified port.

It will listen TCP. If you use -u option will listen UDP.

Second command will send "foo" through ncat and will reach defined IP and port.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
for i in `ls /sys/class/net/`; do echo $i: `cat /sys/class/net/$i/operstate`; done
2012-10-15 18:20:37
User: dragonauta
Functions: echo
Tags: Network device
0
Up
Down
Check the status of a network interface

no need for installing mii-tools, all generic tools

working under archlinux.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl -s mi-ip.net | grep '"ip"' | cut -f2 -d ">" | egrep -o '[0-9.]+'
2012-10-15 16:48:20
User: dragonauta
Functions: cut egrep grep
Tags: Network device ip address
0
Up
Down
What is my ip?

looks at html for "ip" (it's a CSS class), then a little of cut and egrep to get IPv4 address.

I use this oneliner into conky.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sudo /etc/init.d/dns-clean
2012-08-06 18:40:49
User: varghjarta
Functions: sudo
Tags: Network Ubuntu
0
Up
Down
Flush DNS

Flush the DNS cache under Ubuntu (Debian?)

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
nmap -T4 -sn 192.168.1.0/24
2012-06-19 17:07:24
User: drewbled
Tags: Network scanner ip address
0
Up
Down
scan subnet for used IPs

Does a ping scan on the local subnet and returns the IPs that are up

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl ifconfig.me/all
2012-05-16 18:22:28
User: pykler
Tags: Network curl ip address
9
Up
Down
Get your external IP and Network Info

Gets all kind of info, ifconfig.me rocks ...

for just the ip addess you can use ifconfig.me or ifconfig.me/ip

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl ip.nu
2012-04-08 19:43:36
User: VictorBjelkholm
Tags: Network curl ip address geoip
2
Up
Down
Get your external IP address ( 10 characters long )

Shortest url to a external IP-service, 10 characters.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
fping -r1 -Aag <network>/<cidr_mask> 2>/dev/null | sort -gt. -k4
2011-12-21 22:38:51
User: SuperJC
Functions: sort
Tags: Network
0
Up
Down
To know the IP address of the machine current running on the network

Prevents the need for the grep & awk statements. Sort is optional if you don't care about the output order. The network range can also be specified as in the original post.

-A Display targets by address rather than DNS name. (Probably unnecessary...)

-a Show systems that are alive.

S fping -r1 -ag 192.168.nnn.0/24 2>/dev/null

Without sorting...

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
netstat -anpe
2011-12-06 18:27:09
User: anarcat
Functions: netstat
Tags: Network status diagnostic
1
Up
Down
Lists all listening ports together with the PID of the associated process

Lists all opened sockets (not only listeners), no DNS resolution (so it's fast), the process id and the user holding the socket.

Previous samples were limiting to TCP too, this also lists UDP listeners.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
wget ifconfig.me/ip -q -O -
2011-11-30 08:30:35
User: DamirX
Functions: wget
Tags: Network curl ip address
-1
Up
Down
Get your external IP address
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
fping -g 192.168.1.1 192.168.1.10 -r 1 | grep -v unreachable | awk '{print $1}'
2011-11-19 09:11:56
User: Dhinesh
Functions: awk grep
Tags: Network
-1
Up
Down
To know the IP address of the machine current running on the network

List all the machine ip's currently running on your network

Show sample output | Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
until ping -c1 ADDRESS;do true;done;zenity --warning --text "ADDRESS is back"
2011-09-26 18:51:38
User: marcusrp
Functions: ping
Tags: Network zenity
4
Up
Down
Set audible alarm when an IP address comes online

I'd rather this one on Gnome, as I'm used to be listening some music while working. I've even created a bash function which receives ADDRESS as parameter.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
route -n | perl -ne '$ANY="0.0.0.0"; /^$ANY/ and split /\s+/ and print "Gateway to the World: ",($_[1]!=$ANY)?$_[1]:(`ip address show $_[$#_]`=~/peer ([0-9\.]+)/ and $1),", via $_[$#_].\n"'
2011-09-13 08:05:58
User: bandie91
Functions: perl route split
Tags: Network perl IP router gateway
2
Up
Down
Find default gateway (proper at ppp connections too)
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl http://my-ip.cc/host.json
2011-09-01 00:31:49
User: samleb
Tags: Network curl ip address geoip
0
Up
Down
Get your external IP address

JSON version.

Additionally it may give your geolocation if it's known by hostip.info

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
curl http://my-ip.cc/host.xml
2011-09-01 00:30:03
User: samleb
Tags: Network curl ip address geoip
-1
Up
Down
Get your external IP address

XML version.

Additionally it may give your geolocation if it's known by hostip.info

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate