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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.


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May 19, 2015 - A Look At The New Commandlinefu
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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

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Terminal - All commands - 12,379 results
rhost() { if [[ $1 =~ ^[0-9]+$ ]]; then sed -i "$1"d ${HOME}/.ssh/known_hosts; else echo "rhost [n]"; fi }
2013-08-01 21:10:34
User: lowjax
Functions: echo sed
-1

Quickly remove the conflicting line (key) from current users known_hosts file when there is an SSH host conflict. Very nice when you get tired of writing out full commands. Ideally you would place this into your .bash_profile

Usage: rhost [n]

Example: rhost 33 (removes line 33 from ~/.ssh/known_hosts)

Function assumes the $HOME exists, you could alternatively use "~/.ssh/known_hosts"

Mac OSX likes a space for sed -i "$1" d

git push --set-upstream origin master
2017-01-09 00:32:14
Tags: git
-1

After cloning an empty repository on the client ("git clone" just after "git init", for instance), "git push" fails.

In order to be able to push to this repository for the first time, you need to run the above command. It will link your local "master" branch to the "master" branch in the origin server, and push the changes.

This is only necessary only for the first push; after that, you can use just the commands "git push" or "git pull" in order to do this operations.

curl -s http://www.last.fm/user/$LASTFMUSER | grep -A 1 subjectCell | sed -e 's#<[^>]*>##g' | head -n2 | tail -n1 | sed 's/^[[:space:]]*//g'
git branch -a | grep "remotes/origin" | grep -v master | awk -F / '{print $3}' | xargs -I % git clone -b % git://github.com/jamesotron/DevWorld-2010-Cocoa-Workshop %
TIME=$( { time redis-cli PING; } 2>&1 ) ; echo $TIME | awk '{print $3}' | sed 's/0m//; s/\.//; s/s//; s/^0.[^[1-9]*//g;'
2011-08-11 19:09:49
User: allrightname
Functions: awk echo sed time
-1

Outputs the real time it takes a Redis ping to run in thousands of a second without any proceeding 0's. Useful for logging or scripted action.

((x++))
watch 'dmesg | tail -15'
2009-12-20 02:00:05
User: Heoa
Functions: tail watch
-1

Useful with new unknown devices or just monitoring, probably useful for the sysadmin. Updates every 2 seconds. More here: http://linuxclisecurity.blogspot.com/2009/12/monitor-kernel-ring-buffer.html.

df /media/mountpoint |egrep -o '^[/a-z0-9]*'
2011-01-24 21:14:55
User: DaveQB
Functions: df egrep
Tags: grep,df
-1

Shorter way to find the device for a given mountpoint

while true; do sleep $(($RANDOM/1000)) && beep -f 2000 -l $(($RANDOM/100)) ; done
lynx "futz.me/xxx hey this is a test"
2009-09-24 19:23:41
-1

Allows you to send yourself notes from the commandline and receive them via email or text message. Also lets you send pics from the web, pics from your computer, and tweets directly to twitter. All without having to log in Ever.

ex -c '1,$-1000d' -c 'wq' file
awk 'BEGIN { ARGV[ARGC++]=ARGV[ARGC-1] } NR!=FNR { if(num==0) num=NR-1; if(FNR<num) {print} else { ORS=""; print } } ' abc1.txt > abc2.txt
for i in $(chkconfig --list | grep "4:on" | awk {'print $1'}); do chkconfig --level 4 "$i" off; done
2011-01-25 03:54:43
User: m1cawber
Functions: awk chkconfig grep
-1

works in fedora, centos and presumably other distros that use chkconfig

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
watch -n 0.5 ssh [user]@[host] mysqladmin -u [mysql_user] -p[password] processlist | tee -a /to/a/file
2009-08-19 14:21:27
User: lunarblu
Functions: ssh tee watch
-1

Locally watch MySQL process list update every 5s on a remote host. While you watch pipe to a file. The file out put is messy though but hey at least you have a history of what you see.

genpass() { local h x y;h=${1:-8};x=( {a..z} {A..Z} {0..9} );y=$(echo ${x[@]} | tr ' ' '\n' | shuf -n$h | xargs);echo -e "${y// /}"; }
2009-10-24 04:05:42
User: twfcc
Functions: echo tr
-1

make password randomly, default 8 char

gwenview `wget -O - http://xkcd.com/ | grep 'png' | grep '<img src="http://imgs.xkcd.com/comics/' | sed s/title=\".*//g | sed 's/.png\"/.png/g' | sed 's/<img src=\"//g'`
2010-08-24 22:21:51
User: hunterm
Functions: grep sed
-1

Output the html from xkcd's index.html, filter out the html tags, and then view it in gwenview.

/System/Library/CoreServices/Menu\ Extras/User.menu/Contents/Resources/CGSession -suspend
sudo iptables-restore < /etc/iptables.test.rules
2009-08-19 14:38:08
User: kamiller
Functions: iptables-restore sudo
Tags: iptables
-1

If you don't save the rule set it won't be applied during a reboot

curl "http://www.house.gov/house/MemberWWW.shtml" 2>/dev/null | sed -e :a -e 's/<[^>]*>//g;/</N;//ba' | perl -nle 's/^\t\t(.*$)/ $1/ and print;'
2009-09-24 23:37:36
User: drewk
Functions: perl sed
Tags: perl sed curl
-1

Uses curl to download page of membership of US Congress. Use sed to strip HTML then perl to print a line starting with two tabs (a line with a representative)

add-apt-repository [REPOSITORY]
awk -F $'\t' '{printf $1 LS $2 LS $3 LS $4 LS $5; for (i = 7; i < NF; i++) printf $i "\t"; printf "\n--\n";}' LS=$'\n' 'Ad report.tsv' | column -t -s $'\t'
2011-02-28 10:52:16
User: zhangweiwu
Functions: awk column printf
-1

The exported TSV file of Google Adwords' first five columns are text, they usually should collapse into one cell, a multi-line text cell, but there is no guaranteed way to represent line-break within cells for .tsv file format, thus Google split it to 5 columns.

The problem is, with 5 columns of text, there are hardly space to put additional fields while maintain printable output.

This script collapses the first five columns of each row into one single multi-line text cell, for console output or direct send to printer.

find ~ -name '*.sqlite' -exec sqlite3 '{}' 'VACUUM;' \;
unzip /surce/file.zip -d /dest/
wget -q -O - 'http://wap.weather.gov.hk/' | sed -r 's/<[^>]+>//g;/^UV/q' | grep -v '^$'