All commands sorted by votes

All commands (14,187)

sorted by

Transforms a file to all uppercase.
This is sample output - yours may be different.
-1

perl -i -ne 'print uc $_' $1

rbs · 2009-10-15 16:59:38 4
Remove all the files except abc in the directory
This is sample output - yours may be different.
-1

find * ! -name abc | xargs rm

eth2net · 2010-07-18 08:53:18 5
Easily find an old command you run
This is sample output - yours may be different.
-1

cat $HISTFILE | grep command

Stolas · 2013-05-01 13:11:05 7
Disable graphical login on Solaris
This is sample output - yours may be different.
-1

svcadm disable cde-login

fourty2 · 2011-03-24 13:05:15 3
revert one or more changesets in svn

Reverts the changes that were made in a particular revision, in the local working copy. You must commit the local copy to the repository to make it permanent. This is very useful for undoing a change. You can revert multiple changes by specifying numbers wider apart; Just remember to put the highest number first. Show Sample Output
This is sample output - yours may be different.
```
--- Reverse-merging r1337 into 'PATH':
U    PATH
```
-1

svn merge -r 1337:1336 PATH PATH

troelskn · 2009-02-06 00:48:17 45
Remove string with several escaped characters from all files under given path

Removes the given string from all files under the given path - in this case the path given is "." This demonstrates the characters that must be escaped for the grep and sed commands to do their work correctly. Very handy for fixing hacked html files.
This is sample output - yours may be different.
-1

S='<iframe src=\"http:\/\/254.254.254.254\/bad\/index.php\" width=\"1\" height=\"1\" frameborder=\"0\"><\/iframe>' && R=''; find . -name "*.html" -exec grep -l "$S" {} \; | xargs sed -i -e "s/$S/$R/g"

rexington · 2010-04-12 21:45:16 3
recursivly open all recently crashed vim buffers in restore mode

this is great if you loose you ssh connection (with out a screen session) or are working on a laptop with a bad battery, or just a power outage. Modifications: you may not need the -print; the mtime is last modified time in days
This is sample output - yours may be different.
-1

find ./ -type f -mtime -1 -name .*.sw[po] -print | sed -r 's/^(.+)\/\.(\S+)\.sw[op]$/\1\/\2/' | xargs vim -r

nodnarb · 2010-06-16 13:15:10 3
Remove all the files except abc in the directory

Really, you deserve whatever happens if you have a whitespace character in a file name, but this has a small safety net. The truly paranoid will use '-i'.
This is sample output - yours may be different.
-1

rm $( ls | egrep -v 'abc|\s' )

dbbolton · 2010-07-18 10:59:15 4
Get Top Trending Topic on Twiter by location

In these command i use lynx to get the top trend topic of Mexico, if you replace Mexico with other country, you will get the #1 Trending topic
This is sample output - yours may be different.
-1

lynx --dump http://en.trending-topic.com/countries/Mexico/ | grep "62]#" | sed 's/\[62\]//g'

xmuda · 2013-03-12 16:25:14 4

Listen and sort your music, with prompt for deleting (minimal alternative version)

The glob pattern * expands to all files, no need for the 'ls' command. The quotes around "$i" make sure filenames with spaces in them are handled correctly. mplayer determines if it is a media file and plays it, or gives errors and the loop asks if this file has to be removed. Show Sample Output

-1

for i in *; do mplayer "$i" && rm -i "$i"; done

warkruid · 2013-12-26 17:13:23 53

Sort a character string

using awk missed the last char thanks @Josay Show Sample Output
This is sample output - yours may be different.
```
aeeelmoprsst
```
-1

echo sortmeplease | awk '{l=split($1,a,"");asort(a);while(x<=l){printf "%s",a[x];x++ }print "";}'

foob4r · 2009-09-03 10:22:39 4
Multiple open files and go directly to the line where some string is

Open all files which have some string go directly to the first line where that string is and run command on it. Other examples: Run vim only once with multiple files (and just go to string in the first one): grep -rl string_to_find public_html/css/ | xargs vim +/string_to_find Run vim for each file, go to string in every one and run command (to delete line): grep -rl string_to_find public_html/css/ | xargs -I '{}' vim +/string_to_find {} -c ":delete"
This is sample output - yours may be different.
-1

grep -rl string_to_find public_html/css/ | xargs -I '{}' vim +/string_to_find {} -c ":s/string_to_find/string_replaced"

algol · 2012-11-07 14:44:51 5
arp-scan -l without duplicates

This command will scan the subnet and exlude duplicates
This is sample output - yours may be different.
-1

arp-scan -l -g -interface (nic)

pebkac · 2011-01-13 20:29:37 3
Parse logs for IP addresses and how many hits from each IP
This is sample output - yours may be different.
-1

cat "log" | grep "text to grep" | awk '{print $1}' | sort -n | uniq -c | sort -rn | head -n 100

jmorganwalker · 2014-07-08 15:07:24 10
Python version to a file
This is sample output - yours may be different.
-1

python -V >file 2>&1

ngaywood · 2018-11-07 00:53:19 506
Bold matching string without skipping others
This is sample output - yours may be different.
-1

sed 's/pattern/^[[1m&^[[0m/g'

rmcb · 2010-02-12 14:05:34 3
Length of longest line of code

Find the length of the longest line of code in your files. Show Sample Output
This is sample output - yours may be different.
```
96
```
-1

perl -ne 'push(@w, length); END {printf "%0d\n" , (sort({$b <=> $a} @w))[0]}' *.cpp

asolkar · 2010-05-11 19:46:37 4
Python version to a file

More direct like this Show Sample Output
This is sample output - yours may be different.
```
cat file
Python 2.7.12
```
-1

python -V 2> file

keltroth · 2018-11-07 13:21:56 487
Find Apache Root document

Where is my Apache public_html ?!
This is sample output - yours may be different.
-1

grep -i 'DocumentRoot' /usr/local/apache/conf/httpd.conf

locvfx · 2019-06-09 15:48:13 42
Rip audio tracks from CD to wav files in current dir

Rip audio tracks from CD to wav files in current dir
This is sample output - yours may be different.
-1

cdparanoia -B

hemanth · 2009-07-29 07:56:12 4
Continue a current job in the background

Often times you run a command in the terminal and you don't realize it's going to take forever. You can open a new terminal, but you lose the local history of the suspended one. You can stop the running command using , but that may produce undesirable side-effects. suspends the job, and (assuming you have no other jobs running in the background) %1 resumes it. Appending & tells it to run in the background. You now have a job running concurrently with your terminal. Note this will still print any output to the same terminal you're working on. Tested on zsh and bash. Show Sample Output
This is sample output - yours may be different.
```
$ hg pull
<ctrl+z>
zsh: suspended  hg pull
$ %1 &
[1] - continued  hg pull
$ ...
$
$ pulled 4 revisions
(run 'hg update' to get a working copy)

[1]  - done        hg pull
```
-1

<ctrl+z> %1 &

joem86 · 2010-10-25 17:43:38 5
Find out if a module is installed in perl

Will check if the given module is installed in the @INC. It will print the path and return 0 if found, or 1 otherwise. Based on script from SharpyWarpy in http://www.linuxquestions.org/questions/linux-general-1/how-to-list-all-installed-perl-modules-216603/ Show Sample Output
This is sample output - yours may be different.
```
/usr/local/share/perl5/Collectd/Plugins/Graphite.pm
```
-1

perl -MFile::Find=find -MFile::Spec::Functions -Tlwe '$found=1; find { wanted => sub { if (/$ARGV[0]\.pm\z/) { print canonpath $_; $found=0; } }, no_chdir => 1 }, @INC; exit $found;' Collectd/Plugins/Graphite

keymon · 2013-01-11 11:01:46 5
Watch Star Wars via telnet

If you don't have telnet, you can use the bash built-in tcp pipes.
This is sample output - yours may be different.
-1

cat < /dev/tcp/towel.blinkenlights.nl/23

kees · 2017-11-25 12:27:45 27

Give information about your graphic chipset

Use the lshw command to display information about your video card. Give more ouput when run as root. Show Sample Output

-1

lshw -C display

gwir · 2009-04-28 11:49:08 6

Email if you disk is over 90%

Email if you disk is over 90% - www.fir3net.com
This is sample output - yours may be different.
-1

HDD=$(df | awk ' NR>3 (S=$5) (M=$6) { if (S>90) print "Your Systems "M" is """S" Full" } ') ; [[ $HDD ]] && echo "$HDD" | mail -s "Hard-Drives Full" TO@EMAIL.com -- -f FROM@EMAIL.com >/dev/null

felix001 · 2009-10-16 06:52:36 5
‹ First < 496 497 498 499 500 > 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

Remove a line from a file using sed (useful for updating known SSH server keys when they change)

For example, to remove line 5 from foo, type: vi +5d +wq foo

Create arbitrary big file full of zeroes but done in a second

If you want to create fast a very big file for testing purposes and you do not care about its content, then you can use this command to create a file of arbitrary size within less than a second. Content of file will be all zero bytes. The trick is that the content is just not written to the disk, instead the space for it is somehow reserved on operating system level and file system level. It would be filled when first accessed/written (not sure about the mechanism that lies below, but it makes the file creation super fast). Instead of '1G' as in the example, you could use other modifiers like 200K for kilobytes (1024 bytes), 500M for megabytes (1024 * 1024 bytes), 20G for Gigabytes (1024*1024*1024 bytes), 30T for Terabytes (1024^4 bytes). Also P for Penta, etc... Command tested under Linux.

Update your OpenDNS network ip

Intended for dynamic ip OpenDNS users, this command will update your OpenDNS network IP. For getting your IP, you can use one of the many one-liners here on commandlinefu. Example: I use this in a script which is run by kppp after it has successfully connected to my ISP: --- #!/bin/bash IP="`curl -s http://checkip.dyndns.org/ | grep -o '[[:digit:].]\+'`" PW="hex-obfuscated-pw-here" if [ "$IP" == "" ] ; then echo 'Not online.' ; exit 1 else wget -q --user=topsecret --password="`echo $PW | xxd -ps -r`" 'https://updates.opendns.com/nic/update?hostname=myhostname&myip='"$IP" -O - /etc/init.d/ntp-client restart & fi --- PS: DynDNS should use a similar method, if you know the URL, please post a comment. (Something with members.dyndns.org, if I recall correctly)

Remind yourself to leave in 15 minutes

If you spend most of your time in front of the terminal, leave is a useful reminder. Leave can have absolute form: leave 1555 reminds you to leave at 3:55PM

Rename files in batch

all out

How to force a userid to log out of a Linux host, by killing all processes owned by the user, including login shells:

Find usb device

I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

To find which host made maximum number of specific tcp connections

This command is primarily going to work on linux boxes. and needs to be changed, for example IP=10\.194\.194\.2 PORT=389

View Processeses like a fu, fu

Shows a less detailed output, made only of the process tree and their pids.

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