Commands tagged Network sorted by votes

Commands tagged Network (129)

sorted by

Generate random valid mac addresses

Python Alternative Show Sample Output
This is sample output - yours may be different.
```
2a:27:2a:1d:22:0a
37:3d:c9:c8:09:97
...
```
1

python -c "from itertools import imap; from random import randint; print ':'.join(['%02x'%x for x in imap(lambda x:randint(0,255), range(6))])"

ohe · 2010-12-08 11:02:16 5
count of down available ips
This is sample output - yours may be different.
1

nmap -v -sP 192.168.10.0/24 | grep down | wc -l

unixmonkey16033 · 2011-01-03 21:33:02 3
count of down available ips

avoid wc overload ;)
This is sample output - yours may be different.
1

nmap -v -sP 192.168.10.0/24 | grep -c down

ioggstream · 2011-01-04 11:20:27 4
live netcat network throughput test

On the another machine write this command. pv -r /dev/zero | nc 192.168.1.1 7777 It will show live throughput between two machine.The destination machine ip is at our example 192.168.1.1 You must multiply by 8 for the network calculation. You must install pv and netcat commands for this commands usage. kerim@bayner.com http://www.bayner.com/ Show Sample Output
This is sample output - yours may be different.
```
[11.3MB/s]
```
1

nc -l -p 7777 > /dev/null

kerim · 2011-01-24 00:06:45 5
Watch RX/TX rate of an interface in kb/s

A shorter version Show Sample Output
This is sample output - yours may be different.
```
in:    462.78           out:     11.38
```
1

while cat /proc/net/dev; do sleep 1; done | awk '/eth0/ {o1=n1; o2=n2; n1=$2; n2=$10; printf "in: %9.2f\t\tout: %9.2f\r", (n1-o1)/1024, (n2-o2)/1024}'

quadcore · 2011-03-26 02:52:14 3

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

netstat -anpe

anarcat · 2011-12-06 18:27:09 3

Get your external IP address ( 10 characters long )

Shortest url to a external IP-service, 10 characters. Show Sample Output
This is sample output - yours may be different.
```
victor@crunchbang:~$ curl ip.nu
<html>
	<head>
		<title>ip</title>
	</head>
	<body>
		Your IP address is *.228.*.127
	</body>
</html>
```
1

curl ip.nu

VictorBjelkholm · 2012-04-08 19:43:36 3
Check the status of a network interface

no need for installing mii-tools, all generic tools working under archlinux. Show Sample Output
This is sample output - yours may be different.
```
eth0: up
lo: unknown
```
1

for i in `ls /sys/class/net/`; do echo $i: `cat /sys/class/net/$i/operstate`; done

dragonauta · 2012-10-15 18:20:37 4
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.
This is sample output - yours may be different.
1

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

phattmatt · 2012-11-19 17:56:02 5
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
This is sample output - yours may be different.
```
127.0.0.1
10.80.86.3
```
1

ip -o -4 addr show | awk -F '[ /]+' '/global/ {print $4}'

atoponce · 2013-04-09 16:34:39 9
tcpdump whole packets to file in ascii and hex with ip adresses instead of hostname
This is sample output - yours may be different.
1

tcpdump host <IP> -nXXv -s0 -w file.pcap

harpo · 2013-09-04 07:24:04 28
Get a summary of network devices in the system

Basically an improvement on an earlier ethtool command line. Show Sample Output
This is sample output - yours may be different.
```
# eth0
	Speed: Unknown! (65535)
	Link detected: no
# eth1
	Speed: 100Mb/s
	Link detected: yes
# lo
	Link detected: yes
# pan0
	Link detected: yes
# tap1
	Speed: 10Mb/s
	Link detected: no
```
0

for i in /sys/class/net/*; do e=`basename $i`; echo "# $e"; sudo ethtool $e | grep -E "Link|Speed" ; done

hank · 2009-04-25 14:32:08 10
Get your external IP address
This is sample output - yours may be different.
0

wget -qO - http://www.sputnick-area.net/ip;echo

cfajohnson · 2009-11-20 23:10:31 4
Get current connected wireless network with nm-tools

Gets only when the state is connected.
This is sample output - yours may be different.
0

nm-tool 2>/dev/null|sed -n '/Type:[ ]*802.11 WiFi/,/IPv4 Settings/{ /State:[ ]*connected/,/IPv4 Settings/{ s/^[ ]*//;/^\*.*Infra/ { s/^*//;s/:.*//;p }}}'

chmouel · 2010-02-02 12:04:12 3
List alive hosts in specific subnet
This is sample output - yours may be different.
0

for ip in `seq 1 255`; do ping -c 1 192.168.1.$ip ; done | grep ttl

takeshin · 2010-06-05 13:15:06 4
Create a tunnel from a remote server to the local machine using a specific source port

It connects to XXX.XXX.XXX.XXX port YYY, using a source port of "srcport" and binds the tunnel on local port "locport". Then you can connect to localhost:locport. With this command it's possible to connect to servers using a specific source port (useful when a firewall check the source port). Because of the connections starting from the same source port, this works well only for the first connection (for example, works well with SSH and bad with HTTP because of multiple requests). * It requires socat Show Sample Output
This is sample output - yours may be different.
```
cyrus@OMGWTF:~$ socat TCP-LISTEN:3333,fork TCP:192.168.2.2:80,sourceport=12345
```
0

socat TCP-LISTEN:locport,fork TCP:XXX.XXX.XXX.XXX:YYY,sourceport=srcport

cyrusza · 2010-11-22 13:24:33 4
Generate random valid mac addresses

You have to install the package macchanger but this command will create a random mac from a list of known manufacturers. If you want to make a complete random mac, use the -r option .
This is sample output - yours may be different.
0

macchanger -A (nic)

pebkac · 2010-12-07 20:22:54 3
Watch RX/TX rate of an interface in kb/s
This is sample output - yours may be different.
0

while :; do OLD=$NEW; NEW=`cat /proc/net/dev | grep eth0 | tr -s ' ' | cut -d' ' -f "3 11"`; echo $NEW $OLD | awk '{printf("\rin: % 9.2g\t\tout: % 9.2g", ($1-$3)/1024, ($2-$4)/1024)}'; sleep 1; done

DerksIT · 2011-03-22 10:23:33 3
Get your external IP address

JSON version. Additionally it may give your geolocation if it's known by hostip.info Show Sample Output
This is sample output - yours may be different.
```
{
 "host": {
  "ipv4": "188.165.241.33",
  "hostname": "ns390090.ovh.net",
  "address": {
    "city":"Roubaix",
    "country":"FRANCE (FR)",
    "geo": {
     "latitude":50.7,
     "longitude":3.1667
   }
  }
 }
}
```
0

curl http://my-ip.cc/host.json

samleb · 2011-09-01 00:31:49 3
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
This is sample output - yours may be different.
```
fping -r1 -Aag 192.168.nnn.0/24 2>/dev/null | sort -gt. -k4
192.168.nnn.110
192.168.nnn.220
192.168.nnn.231
192.168.nnn.241
```
0

fping -r1 -Aag <network>/<cidr_mask> 2>/dev/null | sort -gt. -k4

SuperJC · 2011-12-21 22:38:51 3

scan subnet for used IPs

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

nmap -T4 -sn 192.168.1.0/24

drewbled · 2012-06-19 17:07:24 3

Flush DNS

Flush the DNS cache under Ubuntu (Debian?)
This is sample output - yours may be different.
0

sudo /etc/init.d/dns-clean

varghjarta · 2012-08-06 18:40:49 10
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
This is sample output - yours may be different.
```
190.192.21.165
```
0

curl -s mi-ip.net | grep '"ip"' | cut -f2 -d ">" | egrep -o '[0-9.]+'

dragonauta · 2012-10-15 16:48:20 4
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
This is sample output - yours may be different.
```
$ ping 0
PING 0 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.497 ms

$ telnet 0 22
Trying 0.0.0.0...
Connected to 0 (0.0.0.0).
Escape character is '^]'.
SSH-2.0-OpenSSH_4.3
```
0

telnet 0 <port>

somaddict · 2012-11-16 03:38:49 4
extraer la MAC del comando ifconfig
This is sample output - yours may be different.
0

ifconfig eth0 | grep HW | cut -d " " -f 11

davidnamy · 2012-12-04 10:18:22 3
< 1 2 3 4 5 > Last ›

What's this?

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

Share Your Commands

Check These Out

Find the package that installed a command

Count the total number of files in each immediate subdirectory

counts the total (recursive) number of files in the immediate (depth 1) subdirectories as well as the current one and displays them sorted. Fixed, as per ashawley's comment

Get the current svn branch/tag (Good for PS1/PROMPT_COMMAND cases)

uses just one sed

a function to create a box of '=' characters around a given string.

First argument: string to put a box around. Second argument: character to use for box (default is '=') Same as command #4948, but shorter, and without the utility function.

Propagate a directory to another and create symlink to content

Lndir create from source directory to destination directory a full symlink tree of all contents of source directory, really useful for propagate changes from a directory to another.

Remove a file whose name begins with a dash ( - ) character

Using the redundant ./ directory information prevents the dash from occurring at the beginning of the filename, and being interpreted as an option of the rm command. Also works using: $ rm -- -filename

Download all Delicious bookmarks

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Undo mkdir -p new/directory/path

Removes all directories on given path, working from right to left, and stops when reaching a non-empty directory Counterpart of $ mkdir -p new/directory/path Shortcut (must be issues as next command immediately after mkdir): $ ^mk^rm ( see http://www.commandlinefu.com/commands/view/19/runs-previous-command-but-replacing )

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands tagged network

Commands tagged Network (129) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands tagged Network (129)

sorted by