Commands using grep sorted by votes

Commands using grep (1,935)

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command line fu roulette, without all the excessive parsing
This is sample output - yours may be different.
-2

function fur () { curl -sL 'http://www.commandlinefu.com/commands/random/plaintext' | grep -v "^# commandlinefu" }

gml · 2011-02-26 11:34:54 35
Randomize GNU grep's color

Randomize GNU grep's colors 31-36 excluding black and white.
This is sample output - yours may be different.
-2

cgrep() { GREP_COLOR="1;3$((RANDOM%6+1))" grep --color=always "$@" }

derekschrock · 2011-03-04 18:45:58 9
Toggle the Touchpad on or off

then xinput set-prop 13 "Device Enabled" 0 how to disable touchpad, and xinput set-prop 13 "Device Enabled" 1 how to enable again "intelligenti pauca" Show Sample Output
This is sample output - yours may be different.
```
&#9116;   &#8627; SynPS/2 Synaptics TouchPad              	id=13	[slave  pointer  (2)]
```
-2

xinput list | grep -i touchpad

0disse0 · 2011-03-20 14:22:14 4
see who is on this machine
This is sample output - yours may be different.
-2

who;ps aux|grep ssh

wynemo · 2011-04-01 06:32:28 3
List your MACs address

Linux specific, requires iproute2 (but most distros have that by default now)
This is sample output - yours may be different.
-2

ip addr show eth0 | grep ether | awk '{print $2}'

ryanc · 2011-05-01 19:54:46 4
Get the rough (german) time from Twitter by @zurvollenstunde

Calc the rough time from Twitter. Now with leading Zeroes. Show Sample Output
This is sample output - yours may be different.
```
20:11
```
-2

printf "%02d:%02d\n" $(curl -s "http://search.twitter.com/search?from=zurvollenstunde&rpp=1" | grep -E '(Es ist jetzt|ago)' | sed 's/<[^>]*>//g;s/[^[:digit:]]//g' | xargs )

torrid · 2011-06-19 18:16:00 3
view user friends
This is sample output - yours may be different.
-2

lynx -useragent=Opera -dump 'http://www.facebook.com/ajax/typeahead_friends.php?u=4&__a=1' |gawk -F'\"t\":\"' -v RS='\",' 'RT{print $NF}' |grep -v '\"n\":\"' |cut -d, -f2

cancerianeyes · 2011-06-24 03:54:14 4
Get pid of running Apache Tomcat process
This is sample output - yours may be different.
-2

ps -eo pid,args | grep -v grep | grep catalina | awk '{print $1}'

evandrix · 2011-06-27 14:29:49 3
Look for jQuery version script include in files *asp*$, *htm*$ ie. not *.aspx.cs
This is sample output - yours may be different.
-2

find . $ -name "*.as[pc]x" -o -name "*.htm*" $ -exec grep -Hi "jquery-1" {} +

evandrix · 2011-07-14 14:28:55 5
Generate an XKCD #936 style 4 word password

The first grep rejects capitalised words since the dict has proper nouns in it that you mightn't want to use. The second grep rejects words with ending in apostrophe s, and the third forces the words to be at least 15 characters long. Show Sample Output
This is sample output - yours may be different.
```
counterproductive unreasonableness multimillionaires extemporaneously
```
-2

cat /usr/share/dict/words | grep -P ^[a-z].* | grep -v "'s$" | grep -Pv ^.\{1,15\}$ | shuf -n4 | tr '\n' ' ' | sed 's/$/\n/'

bugmenot · 2011-08-15 01:03:48 6
Grep with one result at a time

Not perfect but working (at least on the project i wrote it ;) ) Specify what you want search in var search, then it grep the folder and show one result at a time. Press enter and then it will show the next result. It can work bad on result in the firsts lines, and it can be improved to allow to come back. But in my case (a large project, i was checking if a value wasn't used withouth is corresponding const and the value is "1000" so there was a lot of result ...) it was perfect ;)
This is sample output - yours may be different.
-2

search="whatyouwant";data=$(grep "$search" * -R --exclude-dir=.svn -B2 -A2);for((i=$(echo "$data" | wc -l);$i>0;i=$(($i-6)) )); do clear;echo "$data"| tail -n $i | head -n 5; read;done

Juluan · 2011-08-29 18:14:16 4
Find/Replace in a bunch of files and keep a log of the changes

This is a more concise answer to http://blog.commandlinekungfu.com/2011/09/episode-158-old-switcheroo.html in my opinion.
This is sample output - yours may be different.
-2

find . -type f | xargs grep -n "Old Text" | tee filesChanged.txt | sed 's/:.*$//' | xargs sed -i 's/Old Text/New Text/g

moogmusic · 2011-09-06 10:28:36 3
Get the latest version of phpMyAdmin

This is to get the latest version of phpMyAdmin to support scripts to download the latest version of the software if they want to automatically update. Show Sample Output
This is sample output - yours may be different.
```
3.4.4-all-languages
```
-2

wget http://tools.web4host.net/versions.tmp --quiet -O - | grep PHPMYADMIN | sed 's/PHPMYADMIN=//' | cat

wr8cr8 · 2011-09-22 04:11:44 3
Monitoring a port connections

shell loop to scan netstat output avoiding loolback aliases (local/remote swap for local connections) Show Sample Output
This is sample output - yours may be different.
```
tcp6       0      0 127.0.0.1:36089         127.0.0.1:53991         ESTABLISHED
tcp6       0      0 127.0.0.1:36089         127.0.0.1:59053         ESTABLISHED
```
-2

while true ; do sleep 1 ; clear ; (netstat -tn | grep -P ':36089\s+\d') ; done

hute37 · 2011-09-28 11:39:43 5
check open ports (both ipv4 and ipv6)

This option is much faster, as it checks only network nodes. Show Sample Output
This is sample output - yours may be different.
```
apache2   14485 www-data    8u  IPv4 186095222      0t0  TCP *:443 (LISTEN)
apache2   14770 www-data    4u  IPv4 186095213      0t0  TCP *:80 (LISTEN)
```
-2

lsof -Pi | grep LISTEN

5partan · 2011-10-03 12:50:18 3
list current ssh clients
This is sample output - yours may be different.
-2

netstat -atn | grep :22 | grep ESTABLISHED | awk '{print $4}' | sed 's/:22//'

agambier · 2011-11-09 10:51:55 4
Make alert if host is 'dead' or not reachable

Every 20 minutes ping host with IP address 192.168.0.14. If it's not 'alive' or not reachable, then display something eye-catching (here xeyes) on the desktop. Hint for newbies: edit crontab with crontab -e
This is sample output - yours may be different.
-2

10,30,50 * * * * ping -q -c1 -w3 192.168.0.14 | grep '1 received' - || env DISPLAY=:0 xeyes

knoppix5 · 2012-02-06 09:40:11 3
kill defunct processes by killing their parents

defunct processes (zombies) usually have to be killed by killing their parent processes. this command retrieves such zombies and their immediate parents and kills all of the matching processes.
This is sample output - yours may be different.
-2

ps afx | grep defunct -B 1 | grep -Eo "[0-9]{3,}" | xargs kill -9

pholz · 2012-04-27 16:16:34 3
Get the date for the last Saturday of a given month

This is a little trickier than finding the last Sunday, because you know the last Sunday is in the first position of the last line. The trick is to use the NF less than or equal to 7 so it picks up all the lines then grep out any empty lines. Show Sample Output
This is sample output - yours may be different.
```
28
```
-2

cal 04 2012 | awk 'NF <= 7 { print $7 }' | grep -v "^$" | tail -1

javidjamae · 2012-05-03 16:57:45 764
grep files by date and delete

executed on SLES 11.2
This is sample output - yours may be different.
-2

ls -ltr |grep 'May 12'|awk '{print $9;}'|xargs rm -v

harpo · 2012-06-04 12:31:41 3
Get a list of all browsable Samba shares on the target server.
This is sample output - yours may be different.
-2

smbclient -N -gL \\SambaServer 2>&1 | grep -e "Disk|" | cut -d'|' -f2

dynaguy · 2012-07-07 04:45:06 3
Get your current Public IP
This is sample output - yours may be different.
-2

curl -s http://checkrealip.com/ | grep "Current IP Address" | cut -d ' ' -f 4

kjhank · 2012-07-17 23:17:34 3
Get connections from a SSH tunnel

This obtains a list of open connections that a user is connected to if he/she is using a SSH tunnel
This is sample output - yours may be different.
-2

netstat -t -p --extend | grep USERNAME

wr8cr8 · 2012-08-07 02:25:54 6
finds all files that contain "some string"
This is sample output - yours may be different.
-2

find . -type f -exec grep -l "some string" {} \;

dckt · 2012-11-15 10:14:21 4
Get the /dev/disk/by-id fragment for a physical drive

This was tested on Ubuntu 12.04 (Precise) LTS Server. It returns the name of the symlink within /dev/disk/by-id for the physical drive you specify. Change /dev/sda to the one you want, and replace ata- with scsi- or the appropriate type for your drive. I used this to pre-configure grub-pc during a non-interactive install because I had to tell it which disk to install grub on, and physical disks don't have a UUID such as that blkid provides.
This is sample output - yours may be different.
-2

ls -l /dev/disk/by-id | egrep ata-.*`hdparm -i /dev/sda | grep SerialNo | sed 's/.*SerialNo=//' | tr -d "\n"`.*sda$ | sed -e 's/.*ata-/ata-/' -e 's|[ ].*||' | tr -d "\n"

wizonesolutions · 2013-01-07 10:20:25 6
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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" }

Immediately put execute permission on any file saved/created in $HOME/bin

Restore mysql database uncompressing on the fly.

This way you keep the file compressed saving disk space. Other way less optimal using named pipes: mysql -uroot -p'passwd' database <

Fastest segmented parallel sync of a remote directory over ssh

Mirror a remote directory using some tricks to maximize network speed. lftp:: coolest file transfer tool ever -u: username and password (pwd is merely a placeholder if you have ~/.ssh/id_rsa) -e: execute internal lftp commands set sftp:connect-program: use some specific command instead of plain ssh ssh:: -a -x -T: disable useless things -c arcfour: use the most efficient cipher specification -o Compression=no: disable compression to save CPU mirror: copy remote dir subtree to local dir -v: be verbose (cool progress bar and speed meter, one for each file in parallel) -c: continue interrupted file transfers if possible --loop: repeat mirror until no differences found --use-pget-n=3: transfer each file with 3 independent parallel TCP connections -P 2: transfer 2 files in parallel (totalling 6 TCP connections) sftp://remotehost:22: use sftp protocol on port 22 (you can give any other port if appropriate) You can play with values for --use-pget-n and/or -P to achieve maximum speed depending on the particular network. If the files are compressible removing "-o Compression=n" can be beneficial. Better create an alias for the command.

Getting information about model no. of computer

This command gives a model information of a computer. Also useful in determining the host is a VM machine or actual physical machine.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Find top 10 largest files in /var directory (subdirectories and hidden files included )

Same as above, but modified to show human readable output

Console clock -- within screen

Configures screen to always display the clock in the last line (has to be configured only once). After that you not only have got the possibility to detach sessions and run them in background, but also have got a nice clock permanently on your screen.

bulk rename files with sed, one-liner

Far from my favorite, but works in sh and with an old sed that doesn't support '-E'

Rename .JPG to .jpg recursively

This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension).

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Commands using grep (1,935)

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