Commands using grep sorted by votes

Commands using grep (1,935)

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Linux: find names non non-virtual network interfaces

This is used to find externally accessible network interfaces; interfaces that others can connect to us with. By then finding the IP address of these interfaces, we can find addresses that other hosts would use in order to connect to us. Show Sample Output
This is sample output - yours may be different.
```
localhost core # ls -l /sys/class/net/ | grep /devices/ | grep -v /virtual/ | awk '{print $9}'
ens32
```
0

ls -l /sys/class/net/ | grep /devices/ | grep -v /virtual/ | awk '{print $9}'

marksheahan · 2015-02-26 18:46:07 8
Show first IPv4 address for an interface without CIDR mask

Given a network interface (eth0 in this example), find its ip address, without CIDR netmask. Show Sample Output
This is sample output - yours may be different.
```
localhost core # ip addr show dev eth0 | grep -E '\binet\b' | sed 's|.*inet $[^/]*$/.*|\1|' | head -n 1
192.168.128.197
```
0

ip addr show dev eth0 | grep -E '\binet\b' | sed 's|.*inet $[^/]*$/.*|\1|' | head -n 1

marksheahan · 2015-02-26 19:07:10 8
Kill google chrome process

Kills all browser tabs, without killing browser or extensions.
This is sample output - yours may be different.
0

kill $(ps x | grep '\/chrome *.* --type=renderer ' | awk '{print $1}')

karma0 · 2015-03-01 16:28:14 8
Get unique list of files that I've committed directly to the current branch
This is sample output - yours may be different.
0

git log --author="$(git config user.name)" --pretty=format: --name-only --date=iso --no-merges develop.. | grep '.' | sort | uniq

bradym · 2015-03-05 23:22:54 8
Show which programs are listening on TCP ports
This is sample output - yours may be different.
0

netstat -tapn|grep LISTEN

nitrogear · 2015-03-09 21:20:09 8
Kill all salt running processes
This is sample output - yours may be different.
0

ps aux | grep salt | awk '{ print $2}' | xargs kill

mour · 2015-03-12 09:27:14 9
Find IPv4 addresses in files from current directory
This is sample output - yours may be different.
0

grep -R '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' *

nitrogear · 2015-03-12 15:30:12 8
Get name of running Window Manager
This is sample output - yours may be different.
0

wmctrl -m | grep Name: | awk '{print $2}'

naesk · 2015-03-13 18:28:12 9
Know status of Caps, Num and Scroll Lock on Netbook w/o Leds

The command lets you know the status of the Caps, Num and Scroll Lock in the terminal. This is useful when the Netbook has no LED indicators Show Sample Output
This is sample output - yours may be different.
```
black @ blacksimon ? ~ $ xset -q | grep -e Caps
    00: Caps Lock:   off    01: Num Lock:    off    02: Scroll Lock: off
```
0

xset -q | grep -e Caps

Blacksimon · 2015-03-14 18:40:51 8
search "<keyword>" <file>

Add this to your bash profile, then quickly & easily (regex) search for and highlight keywords, with full text output.
This is sample output - yours may be different.
0

function search() { cat ${@:1} | grep --color=always -E "$1|$" }

miscreant · 2015-03-18 18:34:11 40
Keyboard Macros

Show Sample Output
This is sample output - yours may be different.
```
$ <control> + x + ( # start
$ [type your commands]
.
.
$ <control> + x + ) # stop
$ <control> + x + e # Run macro
```
0

man bash | grep -A 9 "Keyboard Macros"

Tiosam · 2015-03-20 17:14:54 9
Ping your gateway at home

I run into regular problems whereby my cable modem from my ISP will simply stop working. To ensure that it is a problem with my cable modem (and not the router in-between my machine and the cable modem), I needed a quick way to test to someplace beyond the cable modem. The place shouldn't be beyond the cable network though. As such, I needed to determine the gateway to which my cable modem was connected. Since my router cannot do this on it's own... I created a single line command that will ping the gateway IP address based upon knowing that my gateway will be my second hop (after my wifi router), tracerouting for 2 hops, pulling the last line of the traceroute output and grep'ing for just the IP address. To stop pinging, use . This works on linux and osx and, with the addition of cygwin tools or the win-gnu project... should work on windows as well. Show Sample Output
This is sample output - yours may be different.
```
traceroute to 8.8.8.8 (8.8.8.8), 2 hops max, 52 byte packets
PING #.#.#.# (#.#.#.#): 56 data bytes
64 bytes from #.#.#.#: icmp_seq=0 ttl=63 time=11.282 ms
64 bytes from #.#.#.#: icmp_seq=1 ttl=63 time=11.902 ms
64 bytes from #.#.#.#: icmp_seq=2 ttl=63 time=9.519 ms
```
0

ping `traceroute -m 2 8.8.8.8 |tail -1|grep -E -o "([0-9]{1,3}[\.]){3}[0-9]{1,3}"`

andrewgearhart · 2015-03-25 19:55:54 74
Check the destination of a shortened URL without opening it

This oneliner will check the target location of any shortened URL, showing all the redirections inbetween. It's useful for getting the unshortened URL without opening the short link in the browser, and it also performs a HEAD request instead of a GET for more speed and a bit more privacy. Show Sample Output
This is sample output - yours may be different.
```
Location: https://youtu.be/vw5uScet3A8
Location: https://www.youtube.com/watch?v=vw5uScet3A8&feature=youtu.be
```
0

curl -sIL http://bit.ly/1aalcwX | grep 'Location: '

EntornoIngrafico · 2015-03-30 11:06:18 8
Scan all available IP addresses on network
This is sample output - yours may be different.
0

nmap -sP $(ip -o addr show | grep inet\ | grep eth | cut -d\ -f 7)

richihiatus · 2015-04-03 21:29:59 9
Get magnet link from URL
This is sample output - yours may be different.
0

curl -s http://host.net/url.html | grep magnet | sed -r 's/.*(magnet:[^"]*).*/\1/g'

alikhalil · 2015-04-05 08:43:01 10
Turn monitor on or off if off or on, respectively

Queries whether the monitor is on according to DPMS. If true then turns the monitor off, if false turns it on. The -display option on xset means the command will work from sessions other than the console, such as ssh or a cron'd script. Command should display any errors if there are any problems (eg no X available), otherwise no output if successful.
This is sample output - yours may be different.
0

xset -display :0 q | grep ' Monitor is On' > /dev/null && xset -display :0 dpms force off || xset -display :0 dpms force on

electrotux · 2015-04-06 19:04:04 11
list all files or directories consuming 1Mb or more

thanks to GREP_COLOR the output will highlite the first 4 digits. if all files are few MB only, this gives a quick overview of how many powers of 10 bigger than 1MB they really are, a logarithmic scale. same works if files are more than 1GB when you replace the "4" by a "7", I usually use "5" in order to manually decide what files to delete...
This is sample output - yours may be different.
0

du -sc .[!.]* * |grep '^[0-9]{4}'

gander · 2015-04-24 10:51:13 10
Duplex PDF from a simplex scanner

Rearrange pdf document coming from a simplex document feed scanner, feeded first with odd pages, then with even pages from the end. Needs pdftk >1.44 w/ shuffle. Similar to http://www.commandlinefu.com/commands/view/7965/pdf-simplex-to-duplex-merge where there are 2 separate documents, odd and even
This is sample output - yours may be different.
0

input=a.pdf ; pages=`pdftk $input dump_data | grep -i numberofpages | cut -d" " -f 2`; pdftk A=$input shuffle A1-$[$pages/2] A$pages-$[$pages/2+1] output "${input%.*}.rearranged.${input##*.}"

kobayashison · 2015-04-26 20:05:20 12
Search for a key word in a large list of files and save the results to a file on the desktop

This is great if you decide to change the name of a variable in multiple .java scripts and want to see a list of where it is used. Once in a text file you can easily sort the info by using find and replace to add /n to every ./ it finds to read your results more clearly. Note: grep will search the current directory. -r stands for recursive which will tell grep to search all directories and subdirectories.
This is sample output - yours may be different.
0

grep -r "word" >> "~/Desktop/filename.txt"

hobopowers · 2015-05-06 12:49:53 9
Grep ip addresses from access attempts to a page and add them to an ipset referenced by an iptables rule
This is sample output - yours may be different.
0

grep page.php /var/log/httpd/access_log|awk '{print $1}'|sort|uniq|perl -e 'while (<STDIN>){chomp; $cmd=`ipset add banned -! -q $_`; }'

luchino7773 · 2015-05-13 07:08:59 10
Display how much memory installed on system

This will display the system memory size in kb. If you want to see the value in mb, you can type: grep MemTotal: /proc/meminfo | awk '{printf("MemTotal: %d MB\n",$2/1024)}' Show Sample Output
This is sample output - yours may be different.
```
$ grep MemTotal: /proc/meminfo
MemTotal:       16385508 kB
```
0

grep MemTotal: /proc/meminfo # display how much memory installed

mpb · 2015-05-15 09:19:02 17
get name of file that is currently playing in mplayer (if there)

grep -v '$/dev/\|pipe:\|socket:$' seemingly looks a bit complicated. This can, of course, be replaced by head -1. However, it is not sure whether the filename line will be first on all systems, so I chose the safer way by filtering out what is not needed here. Show Sample Output
This is sample output - yours may be different.
```
now playing: your fav artist - your fav track.mp3
now playing: your fav movie.mpeg
no track/video playing
```
0

media="$(basename "$(readlink /proc/$(pidof mplayer)/fd/* | grep -v '$/dev/\|pipe:\|socket:$')")" && ((test -n "$media" && echo "now playing: $media") || echo "no track/video playing")

syntaxerror74 · 2015-06-06 13:15:15 9
Calculate Duration Of Files In Directory

When you want to know the duration of all your mp3 files in the current working directory this command will tell you based on exif data. Since it relies on exif data it can be used against other files like movies, ogg vorbis etc. also. Useful when you want to know how long it will take to listen to an album or series of lectures. Show Sample Output
This is sample output - yours may be different.
```
3:15:29
```
0

exiftool * | grep '^Duration' | sed 's/^.*[[:space:]]$[0-9]*:[0-9]*:[0-9]*$.*$/\1/g' | awk -F':' '{ H+=$1;M+=$2;S+=$3 } END { printf "%d:%d:%d\n", int(H+int(M/60)),int(M+S/60)%60,S%60 }'

keyboardsage · 2015-06-17 06:20:47 9
Use grep and aspell to help find crossword answers

You have a clue... 5 Down: You're looking at it (8) You have some letters... C--SS-O-- You use the terminal... Show Sample Output
This is sample output - yours may be different.
```
classroom
classwork
crossbows
crossroad
crosstown
crossword
```
0

grep -i "^c..ss.o..$" <(aspell dump master)

cwmwd24 · 2015-06-24 12:51:00 11
extract ip address from ifconfig using

merge ifconfig grep awk sed you need to change the interface of ifconfig where ip is up Show Sample Output
This is sample output - yours may be different.
```
                 <--------=   IP    =-------->
```
0

ifconfig wlan0 | grep "inet addr:" | awk '{print $2}' | sed -e 's/.*:/\n\n\n/g' | sed 's/$[0-9]\{1,3\}\.$\{3\}[0-9]\{1,3\}/\t\t\t<--------= & =-------->\n\n\n\n\n/g'

lb · 2015-07-13 05:37:31 9
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draw line separator (using knoppix5 idea)

List complete size of directories (do not consider hidden directories)

why make it complicated ? : ] -------------------- I just noticed someone else has posted this on this site before me (sorry I am now a duplicate :/) http://www.commandlinefu.com/commands/view/4313

Print a row of characters across the terminal

Pure Bash This will print a row of characters the width of the screen without using any external executables. In some cases, COLUMNS may not be set. Here is an alternative that uses tput to generate a default if that's the case. And it still avoids using tr. $ printf -v row "%${COLUMNS:-$(tput cols)}s"; echo ${row// /#} The only disadvantage to either one is that they create a variable.

connect via ssh using mac address

Connect to a machine running ssh using mac address by using the "arp" command

Squish repeated delimiters into one

This can be particularly useful used in conjunction with a following cut command like $echo "hello::::there" | tr -s ':' | cut -d':' -f2 which prints 'there'. Much easier that guessing at -f values for cut. I know 'tr -s' is used in lots of commands here already but I just figured out the -s flag and thought it deserved to be highlighted :)

split and combine different pages from different pdf's

The command shows the real power of the pdftk tool, you can do basically everything you want with multiple pdf's. In the command a book is created from chapters, headings and covers.

Validate and pretty-print JSON expressions.

You can use a site like http://www.jsonlint.com/ or use the command line to validate your long and complex json data. This is part of the simplejson package for python http://undefined.org/python/#simplejson. Wrong json expression example: $ echo '{ 1.2:3.4}' | python -m simplejson.tool Expecting property name: line 1 column 2 (char 2)

encode HTML entities

Encodes HTML entities from input (file or stdin) so it's possible to directly past the result to a blog or HTML source file.

do a full file listing of every file found with locate

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.

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Commands using grep (1,935)

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