Commands using grep sorted by votes

Commands using grep (1,935)

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Read just the IP address of a device

Shows a single line per interface (device), with its IPv4 settings. Shorter command, better readability in output. Show Sample Output
This is sample output - yours may be different.
```
    inet 127.0.0.1/8 scope host lo
    inet 192.168.0.1/24 brd 192.168.0.255 scope global eth0
    inet 192.168.200.1/24 brd 192.168.0.255 scope global eth1
```
-3

ip addr|grep "inet "

RickDeckardt · 2009-07-22 07:38:06 7
Get internal and external IP addresses

Gets the internal and external IP addresses of all your interfaces, or the ones given as arguments Show Sample Output
This is sample output - yours may be different.
```
nathan@lion:~$ ips
lo   127.0.0.1      127.0.0.1
eth0 192.168.1.2    80.106.232.129
nathan@lion:~$ ips eth0
eth0 192.168.1.2    80.106.232.129
```
-3

ips(){ for if in ${1:-$(ip link list|grep '^.: '|cut -d\ -f2|cut -d: -f1)};do cur=$(ifconfig $if|grep "inet addr"|sed 's/.*inet addr:$[0-9\.]*$.*/\1/g');printf '%-5s%-15s%-15s\n' $if $cur $(nc -s $cur sine.cluenet.org 128 2>/dev/null||echo $cur);done;}

frozenfire · 2009-08-07 10:04:46 3
Get a text on a position on the file and store in a variable with a specific separator
This is sample output - yours may be different.
-3

TIMEUNIT=$( cat a | grep -n "timescale" | awk -F ":" '{ print $1 } ' )

conradojr · 2009-10-27 18:01:26 3
Return IP Address

grabs your local IP Address. Show Sample Output
This is sample output - yours may be different.
```
192.168.1.100
```
-3

ifconfig -a|grep Bcast:|cut -d\: -f2|awk '{print $1}'

metalx1000 · 2009-12-04 21:00:46 5
Toggle the Touchpad on or off

This command toggles the touchpad on and off, when it's on, the right side scroll strip (annoying) and the tap-clicking are disabled, you can change this by changing occurances of 2 in the command to 0. this whole command can then be given a keyboard shortcut so that the touchpad is disableable without using a special fn key (which linux doesn't recognize on some computers) or a seperate button.
This is sample output - yours may be different.
-3

if [ $(synclient -l | grep TouchpadOff | awk '{print $3}') = "2" ]; then synclient TouchpadOff=1; elif [ $(synclient -l | grep TouchpadOff | awk '{print $3}') == "1" ]; then synclient TouchpadOff=2; else synclient TouchpadOff=2; fi

GinoMan2440 · 2010-01-26 07:52:55 5
determine if a shared library is compiled as 32bit or 64bit

file displays a files type the -L flag means follow sym-links (as libraries are often sym-linked to another this behavior is likely preferred) more complex behavior (*two* grep commands!) could be used to determine if the file is or is not a shared library.
This is sample output - yours may be different.
-3

file -L <library> | grep -q '64-bit' && echo 'library is 64 bit' || echo 'library is 32 bit'

infinull · 2010-03-07 06:31:35 3
show system installation date
This is sample output - yours may be different.
-3

tune2fs -l $(df -P / | tail -n1 | cut -d' ' -f1 ) | grep 'Filesystem created:'

christian773 · 2010-05-29 08:15:25 4
Unique number by Mac Address

gets the last number of the mac address to use it for other stuff Show Sample Output
This is sample output - yours may be different.
```
$ echo $UNIQUE_BY_MAC
213
```
-3

UNIQUE_BY_MAC=$(ifconfig |grep eth0|awk '{ print strtonum("0x"substr($6,16,2)) }')

rubo77 · 2010-06-01 17:34:43 10
Kill process by searching something from 'ps' command
This is sample output - yours may be different.
-3

ps ux|grep <process name>|awk '{print $2}'|xargs -n 1 kill

metalx1000 · 2010-06-18 20:12:37 3
Get the mac address of eth0 in uppercase minus the colons

This will get the mac address of the eth0 and change lowercase to uppercase. The sed command removed the colons.
This is sample output - yours may be different.
-3

ifconfig eth0 | grep 'HWaddr' | awk '{print $5}' | tr 'a-z' 'A-Z' | sed -e 's/://g'

minigeek · 2010-06-26 05:35:03 3
LIST FILENAMES OF FILES CREATED TODAY IN CURRENT DIRECTORY
This is sample output - yours may be different.
-3

TODAY=`date +"%b %d"`;ls -l | grep "$TODAY" | awk '{print $9}'

williamruckman · 2010-07-29 02:28:27 4
LIST FILENAMES OF FILES CREATED TODAY IN CURRENT DIRECTORY
This is sample output - yours may be different.
-3

ls -la | grep $(date +%Y-%m-%d) | egrep -v -e '\.{1,2}' | sed "s/.*\:[0-9]\{2\} $.\+$$/\\1/g"

cicatriz · 2010-07-29 14:37:51 3
wmi

Get windows version with servicepack and hostname Show Sample Output
This is sample output - yours may be different.
```
wmic -U DOMAIN/user --password='password'  //IP_HOST "select Caption,CSDVersion,CSName  from Win32_OperatingSystem" | grep Windows
```
-3

wmic -U DOMAIN/user --password='password' //IP_HOST "select Caption,CSDVersion,CSName from Win32_OperatingSystem" | grep Windows

dr_gogeta86 · 2010-09-20 14:23:37 132
See where a shortened url takes you before click

We can put this inside a function: fxray() { curl -s http://urlxray.com/display.php?url="$1" | grep -o '<title>.*</title>' | sed 's/<title>.*--> $.*$<\/title>/\1/g'; }; fxray http://tinyurl.com/demo-xray Show Sample Output
This is sample output - yours may be different.
```
http://urlxray.com/sex-so-hot-it-will-blow-your-mind.php

(Note: this result is totally SFW)
```
-3

curl -s http://urlxray.com/display.php?url=http://tinyurl.com/demo-xray | grep -o '<title>.*</title>' | sed 's/<title>.*--> $.*$<\/title>/\1/g'

karpoke · 2010-09-30 10:25:18 4
uninstall Air on Ubuntu
This is sample output - yours may be different.
-3

sudo dpkg -P $(dpkg -l | grep -i adobeair)

xmonkey · 2010-11-02 14:09:16 4
Get your local IP regardless of your network interface

short enough to be tweetable Show Sample Output
This is sample output - yours may be different.
```
192.168.1.102
```
-3

ifconfig | grep "inet\ " | grep -v "127.0" | sed -e 's/inet\ addr://g' | sed -e 's/Bcast:/\ \ \ \ \ \ \ /g' | cut -c 1-29 | sed -e 's/\ //g'

LinuxMan · 2010-12-01 19:06:11 4
find the device when you only know the mount point

most usefull when creating batch scripts using several usb drives and some commands like mkntfs needs a device name the -w option for grep is here to filter lines when you have multiple drives with the same volume label. Without this option, the grep command will return /media/KINGSTON /media/KINGSTON_ /media/KINGSTON__ Show Sample Output
This is sample output - yours may be different.
```
/dev/sdc1
```
-3

df | grep -w /media/KINGSTON | awk {'print $1'}

vilain_mamuth · 2011-01-20 09:07:19 3
Download random gifs from gifbin.com

Download a bunch of random animated gifs from http://gifbin.com/
This is sample output - yours may be different.
-3

site="http://gifbin.com/"; for i in $(wget -qO- "$site"random| sed -r "s/^.*(bin\/.+\.gif).*$/\1/m" | grep "^bin"); do wget -c "$site$i"; filename=`basename $i`; [ `identify $filename | wc -l` -gt 1 ] || rm -f $filename; done

az · 2011-02-15 10:05:37 7
See where MySQL is looking for its config files

This will show the locations, in order of preference, that MySQL will look for a configuration file Show Sample Output
This is sample output - yours may be different.
```
                      order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/my.cnf /etc/mysql/my.cnf /usr/local/mysql/etc/my.cnf ~/.my.cnf 
```
-3

mysql -? | grep ".cnf"

DarkSavant · 2011-04-02 15:45:52 3
Show a config file without comments
This is sample output - yours may be different.
-3

grep -Pv '^\S*(#|$)'

endre · 2011-05-13 11:40:12 6
Show the processes that use old libs and need a restart

Useful after a complete system update (without a new kernel) when you want to know, which processes need to be restarted Show Sample Output
This is sample output - yours may be different.
```
# lsof | grep 'DEL.*lib' | cut -f 1 -d ' ' | sort -u
crond
mpd
nginx
parcellite
X
```
-3

lsof | grep 'DEL.*lib' | cut -f 1 -d ' ' | sort -u

leenucks · 2011-05-30 20:45:58 3
Apache server config file
This is sample output - yours may be different.
-3

apache2ctl -V | grep SERVER_CONFIG_FILE

userevolution · 2011-06-03 17:02:49 4
Search recursively to find a word or phrase in certain file types, such as C code

Original submitter's command spawns a "grep" process for every file found. Mine spawns one grep with a long list of all matching files to search in. Learn xargs, everyone! It's a very powerful and always available tool.
This is sample output - yours may be different.
-3

find . -name "*.[ch]" -print | xargs grep -i -H "search phrase"

jblaine · 2011-06-05 23:27:30 3
Check your ip public using dyndns.org

Show Sample Output
This is sample output - yours may be different.
```
[v3n0m@localhost]$ wget http://checkip.dyndns.org/ -q -O - | grep -Eo '\<[[:digit:]]{1,3}(\.[[:digit:]]{1,3}){3}\>'
80.254.66.131
[v3n0m@localhost]$
```
-3

wget http://checkip.dyndns.org/ -q -O - | grep -Eo '\<[[:digit:]]{1,3}(\.[[:digit:]]{1,3}){3}\>'

unixmonkey24730 · 2011-09-17 12:51:06 3
Locate a list of processes by process name that need to be killed

* ps -ef # list running processes * grep string * pull the process names from 8th field * cut and delimiter '/' * print 4th field * get rid of trailing grep * for loop killall -9 $i which is the process name Show Sample Output
This is sample output - yours may be different.
```
NULL
```
-3

for i in `ps -ef | grep tracker | awk '{print $8}' | cut -d'/' -f4 | grep -v grep`; do killall -9 $i; done

alienone · 2011-12-04 13:20:19 4
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rsync over ssh via non-default ssh port

tested on cygwin and Fedora 9 . good to remember for those jobs where you cannot set a site-specific connect option in your ~/.ssh/config file.

Rename files in batch

Find unused IPs on a given subnet

This command can be used to extract the IP address of the network.

can be used within a script to configure iptables for example: iface=$2 inet_ip=`ifconfig "$iface" | grep inet | cut -d: -f2 | cut -d ' ' -f1` ipt="sudo /sbin/iptables" ......................... ---------------------------------------------------------------------------------------------------------------- $ipt -A INPUT -i $iface ! -f -p tcp -s $UL -d $inet_ip --sport 1023: --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT ---------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- $ipt -A OUTPUT -o $iface -p tcp -s $inet_ip -d $UL --sport 3306 --dport 1023: -m state --state ESTABLISHED,RELATED -j ACCEPT -----------------------------------------------------------------------------------------------------------------

fix broken permissions

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

pretend to be busy in office to enjoy a cup of coffee

list block devices

Shows all block devices in a tree with descruptions of what they are.

Search some text from all files inside a directory

Extract all of the files on an RPM on a non-RPM *nix

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Commands using grep (1,935)

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