All commands sorted by votes

All commands (14,187)

sorted by

Print free RAM in MB

Does not output the word "shared" so you can easily store this number in a variable. Show Sample Output
This is sample output - yours may be different.
```
1029
```
0

free -m | awk '/cache:/ {print $4}'

felixhummel · 2012-03-13 19:54:26 4
firefox ascii logo
This is sample output - yours may be different.
0

curl -s http://people.mozilla.com/~faaborg/files/shiretoko/firefoxIcon/firefox-64.png | convert - jpg:- | jp2a --color --html -> firefox.html

kev · 2012-04-30 16:31:07 5
Create a tar archive from a text list without trailing slash in directories
This is sample output - yours may be different.
0

cat list.txt | pax -wd > archive.tar

bugmenot · 2013-01-02 17:53:52 4
Find files in current directory which are larger in size (500000k)
This is sample output - yours may be different.
0

find . -type f -size +50000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

maheshmahajan · 2014-06-24 07:24:39 7
Calculate CPU load limit on GNU/Linux

shell order of operation example which calculates: x = number of physical CPU's y = number of cores per CPU 2(x * y) + 1 = CPU load limit Show Sample Output
This is sample output - yours may be different.
```
9
```
0

echo "$(( $(( $(grep 'physical id' '/proc/cpuinfo' | uniq | wc -l) * $(grep 'core id' '/proc/cpuinfo' | wc -l) )) * 2 + 1 ))"

snorf · 2015-11-14 20:44:39 11
Gets shellcode opcodes from binary file using objdump

Seems to work on Ubuntu 14.02 LTS Show Sample Output
This is sample output - yours may be different.
```
"\x31\xc0\xb0\x04\x31\xdb\xb3\x01\xeb\x11\x59\x31\xd2\xb2\x0e\xcd\x80\x31"
```
0

objdump -s ./HelloWorld | grep -v '^ [0-9a-f][0-9a-f][0-9a-f][0-9a-f] \b' | grep -v 'Contents' | grep -v './' | cut -d' ' -f 3-6| sed 's/ //g' | sed '/./!d' | tr -d '\n'| sed 's/.\{2\}/&\\x/g' | sed 's/^/\\x/'|sed 's/..$//'|sed 's/^/"/;s/$/"/g'

mark20 · 2016-10-05 23:31:05 17
Color code each job for GNU Parallel

Colorize each job in a new color.
This is sample output - yours may be different.
0

parallel -j10 --tagstring '\033[30;{=$_=++$::color%8+90=}m' sleep .3{}\;seq {} ::: {1..10}

unixmonkey91589 · 2017-07-05 19:36:27 20
Creat a new user with no shell. Useful to provide other services without giving shell access.
This is sample output - yours may be different.
0

useradd -s /sbin/nologin nicdev

nicdev · 2009-02-15 14:49:17 10
print latest (top 10, top 3 or *) commandlinefu.com commands

This lengthy cryptic line will print the latest top 10 commandlinefu.com posts without their summaries. To print also their respective summaries use the following (even bigger) command line: wget -qO - http://www.commandlinefu.com/feed/tenup | xmlstarlet sel -T -t -o '<doc>' -n -t -m rss/channel/item -o '<item>' -n -o '<title>' -v title -o '</title>' -n -o '<description>' -v description -o '</description>' -n -o '</item>' -n -t -o '</doc>' | xmlstarlet sel -T -t -m doc/item -v description/code -n -v title -n -n It is recommended to include this line into a shell script to be easily run, as I do myself. You could also use the following URLs to browse the top 3 commands: wget -qO - http://www.commandlinefu.com/feed/threeup | xmlstarlet ... .. or all others: wget -qO - http://feeds2.feedburner.com/Command-line-fu | xmlstarlet ... PS: You need to install "xmlstarlet" to run it. It is found in Debian APT repositories (apt-get install xmlstarlet) or under the http://xmlstar.sourceforge.net/ URL. Show Sample Output
This is sample output - yours may be different.
```
$ ps aux | grep [p]rocess-name
$ getconf LONG_BIT
$ for I in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $I | gzip > $I.sql.gz"; done
$ free && sync && echo 3 > /proc/sys/vm/drop_caches && free
$ find . -empty -type d -exec rmdir {} +
$ exiftool '-Directory<DateTimeOriginal' -d %Y/%m/%d dir
$ tmpfile=$(mktemp) && echo -e 'startup_message off\nscreen -t top htop\nsplit\nfocus\nscreen -t nethogs nethogs wlan0\nsplit\nfocus\nscreen -t iotop iotop' > $tmpfile && sudo screen -c $tmpfile
$ /sbin/kexec -l /boot/$KERNEL --append="$KERNELPARAMTERS" --initrd=/boot/$INITRD; sync; /sbin/kexec -e
$ dig +short txt <keyword>.wp.dg.cx
$ autossh -M50000 -t server.example.com 'screen -raAd mysession'
$ knock <host> 3000 4000 5000 && ssh -p <port> user@host && knock <host> 5000 4000 3000
$ cat /var/log/secure.log | awk '{print substr($0,0,12)}' | uniq -c | sort -nr | awk '{printf("\n%s ",$0) ; for (i = 0; i<$1 ; i++) {printf("*")};}'
$ for x in `jot - 0 2400 25`; do curl "http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/$x"  ; done > commandlinefu.txt
$ ssh -t remote_host screen -r
$ diff <(echo "$a") <(echo "$b")
```
0

wget -qO - http://www.commandlinefu.com/feed/tenup | xmlstarlet sel -T -t -o '<x>' -n -t -m rss/channel/item -o '<y>' -n -v description -o '</y>' -n -t -o '</x>' | xmlstarlet sel -T -t -m x/y -v code -n

fsilveira · 2009-08-14 02:44:00 3
Outputs a 10-digit random number
This is sample output - yours may be different.
0

echo $RANDOM$RANDOM$RANDOM |cut -c3-12

emmerich164 · 2009-10-13 08:08:45 4
Ignore subdirectories in subversion

If you would like to ignore a directory including its subdirectory. For example, a tmp/ directory
This is sample output - yours may be different.
0

find . -type d -not $ -name .svn -prune $ -exec svn propset svn:ignore '*' {} \;

tristan_ph · 2010-08-15 03:45:57 4
GREP a PDF file.
This is sample output - yours may be different.
0

grep -i '[^script$]' 1.txt

vinod · 2010-10-20 12:17:04 3
Convert .ogg to .avi
This is sample output - yours may be different.
0

mencoder -idx a.ogg -ovc lavc -oac mp3lame -o b.avi

lukasz · 2010-12-20 14:30:48 3
get a random command
This is sample output - yours may be different.
0

find $(echo "$PATH" | tr ':' ' ') -name "*program*"

hunterm · 2011-01-07 22:27:44 5
Losslessly optimize JPEG files for file size

You can also save EXIF information by copying it to temp.jpg: jpegtran -optimize -outfile temp.jpg <JPEG> && jhead -te temp.jpg "$_" && mv temp.jpg "$_"
This is sample output - yours may be different.
0

jpegtran -optimize -outfile temp.jpg <JPEG> && mv temp.jpg "$_"

h3xx · 2011-07-24 08:55:46 3
Access to a SVN repository on a different port

first need to Edit the configuration file /home/cicciobomba/.subversion and under the [tunnels] add this line ciccio_diverso = /usr/bin/ssh -p 12345
This is sample output - yours may be different.
0

sudo svn co svn+ ciccio_diverso://root@192.160.150.151/svn-repo/progettino

0disse0 · 2012-02-03 18:16:02 12
Filter Android log output by PID
This is sample output - yours may be different.
0

adb shell ps | grep my.app.packagename | awk '{print $2}' | xargs -I ? sh -c "adb logcat -v time | grep ?"

jackpatmos · 2012-03-14 10:02:11 5
Pretend your shell is MS-DOS command.com

(This may be specific to bash only.) This transforms the current working directory to all uppercase characters and replaces forward slashes with backslashes, prepending the string with "C:" and appending a single ">". It serves no practical purpose, but may serve as a great practical joke if you can insert it to some victim's .bashrc :-) Show Sample Output
This is sample output - yours may be different.
```
C:\>pwd
/
C:\>
```
0

export PROMPT_COMMAND=$PROMPT_COMMAND'; export PWD_UPCASE="${PWD^^}"'; export PS1='C:${PWD_UPCASE//\\//\\\\}>'

chungy · 2012-04-30 20:09:49 3
Command to kill PID

You can also use gawk: ps auxww | gawk '/application/' | gawk '/processtobekilled/' | gawk '{print $2}' | grep -v grep | xargs kill -9
This is sample output - yours may be different.
0

ps auxww | grep application | grep processtobekilled | gawk '{print $2}' | grep -v grep | xargs kill -9

j0sh10 · 2012-07-03 20:37:56 43
Get user's full name in Mac OS X
This is sample output - yours may be different.
0

finger `whoami` | awk -F: '{ print $3 }' | head -n1 | sed 's/^ //'

andrew_duffy · 2013-01-03 20:19:03 7
Sync a remote mysql database to a local db via SSH

There must be no space between -p and the password
This is sample output - yours may be different.
0

ssh <remoteuser>@<remoteserver> \ 'mysqldump -u <user> -p<password> <database>' \ | mysql -u <user> -p<password> <database>

kvcrawford · 2013-03-05 19:20:52 14
Maximize active window

Bind it to a shortcut key, using something like xbindkeys-config (if you do not have xbindkeys: apt-get install xbindkeys xbindkeys-config)
This is sample output - yours may be different.
0

wmctrl -r :ACTIVE: -b add,maximized_vert; wmctrl -r :ACTIVE: -b add,maximized_horz

paulera · 2013-04-24 16:59:04 11
bulk git pull
This is sample output - yours may be different.
0

for dir in ~/git/*; do (cd "$dir" && git pull); done

oumu · 2013-07-06 14:24:18 7
IBM AIX: Verify a sha256sum listing with openssl

This command is used to verify a sha256sum-formatted file hash list on IBM AIX or any other UNIX-like OS that has openssl but doesn't have sha256sum by default. Steps: 1: Save to the filesystem a script that: A: Receives as arguments the two parts of one line of a sha256sum listing B: Feeds a file into openssl on SHA256 standard input hash calculation mode, and saves the result C: Compares the calculated hash against the one received as argument D: Outputs the result in a sha256sum-like format 2: Make the script runnable 3: Feed the sha256sum listing to xargs, running the aforementioned script and passing 2 arguments at a time Show Sample Output
This is sample output - yours may be different.
```
cognos-EARs/ServletGateway-1021-SDK-customized.ear: OK
cognos-EARs/ServletGateway-1021-SDK-customizedandfixed.ear: OK
cognos-EARs/ServletGateway-1021-base.ear: OK
cognos-EARs/p2pd-1021-SDK-customized.ear: OK
cognos-EARs/p2pd-1021-base.ear: OK
```
0

echo '#! /usr/bin/ksh\ncat $2 | openssl dgst -sha256 | read hashish; if [[ $hashish = $1 ]]; then echo $2: OK; else echo $2: FAILED; fi;' > shacheck; chmod +x shacheck; cat hashishes.sha256 | xargs -n 2 ./shacheck;

RAKK · 2013-09-18 21:51:20 8
Convert a .ogv recording (eg from recordmydesktop in Gnome/Linux) into a .wmv (eg for playback in Windows)

I needed to convert a screen capture when using Gnome's "recordmydesktop" and convert it to a .wmv for playback in Windows.
This is sample output - yours may be different.
0

ffmpeg -i input.ogv -qscale 0 output.wmv # convert .ogv to .wmv

mpb · 2014-06-24 16:23:18 7
‹ First < 417 418 419 420 421 > 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

Set a posix shell to echo all commands that it's about to execute, after all expansions have been done.

the 'set -x' mode can be exited by typing $ set +x

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Create a new file

ThePirateBay.org torrent search

usage: tpb searchterm example: tpb the matrix trilogy This searches for torrents from thepiratebay and displays the top results in reverse order, so the 1st result is at the bottom instead of the top -- which is better for command line users

Unlock VMs in Proxmox

Unlock your VMS to avoid problems after some failed tasks ended.

Gets the last string of previous command with !$

It helps you save a lot of writing :-)

Look up the definition of a word

A bash function might also be useful: $ dict() { curl dict://dict.org/d:$1; } Or if you want less verbose output: $ dict() { curl -s dict://dict.org/d:$1 | perl -ne 's/\r//; last if /^\.$/; print if /^151/../^250/'; }

Quickly Encrypt a file with gnupg and email it with mailx

This is a quick and easy way of encrypting files in a datastream, without ever really creating an output file from gpg. Useful with cron also, when file(s) have to be sent based on a set schedule.

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" }

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

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)

All commands (14,187) 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…

All commands (14,187)

sorted by