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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Top Tags



Psst. Open beta.

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:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Commands using cut from sorted by
Terminal - Commands using cut - 495 results
cut -d: -f1 /etc/group | sort
find -not -empty -type f -printf "%-30s'\t\"%h/%f\"\n" | sort -rn -t$'\t' | uniq -w30 -D | cut -f 2 -d $'\t' | xargs md5sum | sort | uniq -w32 --all-repeated=separate
2014-10-19 02:00:55
User: fobos3
Functions: cut find md5sum sort uniq xargs

Finds duplicates based on MD5 sum. Compares only files with the same size. Performance improvements on:

find -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate

The new version takes around 3 seconds where the old version took around 17 minutes. The bottle neck in the old command was the second find. It searches for the files with the specified file size. The new version keeps the file path and size from the beginning.

host `hostname` | rev | cut -d' ' f1 | rev
2014-10-01 18:55:05
Functions: cut host rev

Gives the DNS listed IP for the host you're on... or replace `hostname` with any other host

finger $(whoami) | egrep -o 'Name: [a-zA-Z0-9 ]{1,}' | cut -d ':' -f 2 | xargs echo
2014-09-24 01:22:07
User: swebber
Functions: cut egrep finger xargs

Its possible to user a simple regex to extract de username from the finger command.

The final echo its optional, just for remove the initial space

while true; do ps aux | sort -rk 3,3 | head -n 11 | cut -c -120 | netcat -l -p 8888 2>&1 >/dev/null; done &
2014-08-29 07:10:57
User: manumiu
Functions: cut head ps sort

If you want to see your top ten cpu using processes from the browser (e.g. you don't want to ssh into your server all the time for checking system load) you can run this command and browse to the machines ip on port 8888. For example

grep Failed auth.log | rev | cut -d\ -f4 | rev | sort -u
2014-08-14 14:57:41
User: supradave
Functions: cut grep rev sort

Find the failed lines, reverse the output because I only see 3 indicators after the IP address, i.e. port, port#, ssh2 (in my file), cut to the 4th field (yes, you could awk '{print $4}'), reverse the output back to normal and then sort -u (for uniq, or sort | uniq).

tail -f LOG_FILE | grep --line-buffered SEARCH_STR | cut -d " " -f 7-
2014-08-07 10:40:45
User: pjsb
Functions: cut grep tail
Tags: grep cut tail -f

Outputs / monitors the content of the LOG_FILE , which matches the SEARCH_STR. The output is cutted by spaces (as delimiter) starting from column 7 till the end.

netstat -tn 2>/dev/null | grep :80 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head
bkname="test"; tobk="*" ; totalsize=$(du -csb $tobk | tail -1 | cut -f1) ; tar cvf - $tobk | tee >(sha512sum > $bkname.sha512) >(tar -tv > $bkname.lst) | mbuffer -m 4G -P 100% | pv -s $totalsize -w 100 | dd of=/dev/nst0 bs=256k
2014-07-22 15:47:50
User: johnr
Functions: cut dd du tail tar tee

This will write to TAPE (LTO3-4 in my case) a backup of files/folders. Could be changed to write to DVD/Blueray.

Go to the directory where you want to write the output files : cd /bklogs

Enter a name in bkname="Backup1", enter folders/files in tobk="/home /var/www".

It will create a tar and write it to the tape drive on /dev/nst0.

In the process, it will

1) generate a sha512 sum of the tar to $bkname.sha512; so you can validate that your data is intact

2) generate a filelist of the content of the tar with filesize to $bkname.lst

3) buffer the tar file to prevent shoe-shining the tape (I use 4GB for lto3(80mb/sec), 8gb for lto4 (120mb/sec), 3Tb usb3 disks support those speed, else I use 3x2tb raidz.

4) show buffer in/out speed and used space in the buffer

5) show progress bar with time approximation using pv


To eject the tape :

; sleep 75; mt-st -f /dev/nst0 rewoffl


1) When using old tapes, if the buffer is full and the drive slows down, it means the tape is old and would need to be replaced instead of wiping it and recycling it for an other backup. Logging where and when it slows down could provide good information on the wear of the tape. I don't know how to get that information from the mbuffer output and to trigger a "This tape slowed down X times at Y1gb, Y2gb, Y3gb down to Zmb/s for a total of 30sec. It would be wise to replace this tape next time you want to write to it."

2) Fix filesize approximation

3) Save all the output to $bkname.log with progress update being new lines. (any one have an idea?)

4) Support spanning on multiple tape.

5) Replace tar format with something else (dar?); looking at xar right now (https://code.google.com/p/xar/), xml metadata could contain per file checksum, compression algorithm (bzip2, xv, gzip), gnupg encryption, thumbnail, videopreview, image EXIF... But that's an other project.


1) You can specify the width of the progressbar of pv. If its longer than the terminal, line refresh will be written to new lines. That way you can see if there was speed slowdown during writing.

2) Remove the v in tar argument cvf to prevent listing all files added to the archive.

3) You can get tarsum (http://www.guyrutenberg.com/2009/04/29/tarsum-02-a-read-only-version-of-tarsum/)

and add >(tarsum --checksum sha256 > $bkname_list.sha256) after the tee to generate checksums of individual files !

cut -f 2 -d ':' oclHashcat.pot | egrep -oi '[a-z]{1,20}' | sort | uniq > base.pot
translate () {lang="ru"; text=`echo $* | sed 's/ /%20/g'`; curl -s -A "Mozilla/5.0" "http://translate.google.com/translate_a/t?client=t&text=$text&sl=auto&tl=$lang" | sed 's/\[\[\[\"//' | cut -d \" -f 1}
2014-07-10 18:26:34
User: 2b
Functions: cut sed

Change lang from ru to something else.

Curl version - Mac OS etc, any system w/o wget.

for a in $(find . -maxdepth 1 -name "*.mp4" -type f -printf "%f\n" | rev | cut -d '.' -f2- | rev | sort -u); do if [ ! -f "$a.mp3" ]; then avconv -i "$a."* -vn -ab 128 "$a.mp3"; fi done
2014-06-27 05:13:53
User: adanisch
Functions: cut find rev sort

Good for when you download youtube videos and want the mp3 for your mp3 player.

netstat -lptu | grep -E "22.*ESTABLISHED" | cut -s -d ':' -f2 | awk '{print $2}'
2014-06-13 08:38:16
User: DarkXDroid
Functions: awk cut grep netstat

Show If Someone Is Connected To The Android Device On And Get Their IP Address

translate(){wget -U "Mozilla/5.0" -qO - "https://translate.google.com/translate_a/single?client=t&sl=${3:-auto}&tl=${2:-en}&dt=t&q=$1" | cut -d'"' -f2}
2014-06-10 12:08:51
User: klisanor
Functions: cut
translate <some phrase> [output-language] [source-language]

1) "some phrase" should be in quotes

2) [output-language] - optional (default: English)

3) [source-language] - optional (default: auto)

translate "bonjour petit lapin"

hello little rabbit

translate "bonjour petit lapin" en

hello little rabbit

translate "bonjour petit lapin" en fr

hello little rabbit

dig MX example.com +short | cut -d' ' -f2 | sed '1q;d' | xargs dig +short
$ wget --no-check-certificate -q checkip.dyndns.org -O index.html && cat index.html|cut -d ' ' -f 6 | cut -d '<' -f 1
2014-05-12 07:10:29
User: Superkikim
Functions: cat cut wget

This is the command line I use to get my IP address in order to update my zoneedit account. Full script on my blog http://akim.sissaoui.com/linux-attitude/script-de-mise-a-jour-ddns-zoneedit-com-en-bashsh/

ifconfig |grep HWaddr |cut -d ' ' -f 1,11 |grep eth0 |cut -d ' ' -f 2|xargs | awk -F':' '{ print $1$2$3$4$5$6 }'
2014-04-25 18:43:47
User: simplewall
Functions: awk cut grep ifconfig xargs

Many tasks need mac id check. above command exactly do the same

for i in `grep -ri "?\|?\|?\|?\|?" * --col | cut -d: -f1 |sort -u `;do sed -i "s/?/\&aacute;/g" $i; sed -i "s/?/\&eacute;/g" $i; sed -i "s/?/\&iacute;/g" $i; sed -i "s/?/\&oacute;/g" $i; sed -i "s/?/\&uacute;/g" $i; echo "HTMLizing file [$i]";done
2014-04-24 11:43:36
User: linuxninja
Functions: cut echo sed sort

If we've many files containing (?, ?, ?, ?, ? ) characters instead of ?, ?,... etc,...

we can ue this simple command line running a sed command inside a for loop searching for files containing that characters.

Hope u like it! Enjoy! ;)

echo $(sudo lshw -businfo | grep -B 1 -m 1 $(df "/path/to/file" | tail -1 | awk '{print $1}' | cut -c 6-8) | head -n 1 | awk '{print $1}' | cut -c 5- | tr ":" "-") | sudo tee /sys/bus/usb/drivers/usb/unbind
2014-04-06 12:06:29
User: tweet78
Functions: awk cut df echo grep head sudo tail tee tr

You have an external USB drive or key.

Apply this command (using the file path of anything on your device) and it will simulate the unplug of this device.

If you just want the port, just type :

echo $(sudo lshw -businfo | grep -B 1 -m 1 $(df "/path/to/file" | tail -1 | awk '{print $1}' | cut -c 6-8) | head -n 1 | awk '{print $1}' | cut -c 5- | tr ":" "-")

netstat -tn 2>/dev/null | grep ':80 ' | awk '{print $5}' |sed -e 's/::ffff://' | cut -f1 -d: | sort | uniq -c | sort -rn | head
2014-03-12 12:43:07
User: copocaneta
Functions: awk cut grep netstat sed sort uniq

IP addresses and number of connections connected to port 80.

read -p "Please enter the 4chan url: "|egrep '//i.4cdn.org/[a-z0-9]+/src/([0-9]*).(jpg|png|gif)' - -o|nl -s https:|cut -c7-|uniq|wget -nc -i - --random-wait
arecord -q -f cd -d 1 recvol.wav;sox recvol.wav -n stat 2>&1|grep RMS|grep amplitude|cut -d"." -f2|cut -c 1-2>recvol;echo $((`cat recvol`+1))>recvol;rec -t wav - silence 1 0.1 `cat recvol` -1 1.0 `cat recvol`%|lame -s 44.1 -a -v - >record.mp3
2014-02-27 23:23:55
User: geaplanet
Functions: arecord cd cut echo grep stat

It find out the mic recording level at the moment of run the command and if a noise level is higher it starts to record an mp3 file. The resulting file will have only the sounds not the silences.

eval $(history | cut -c 8- | grep "adb connect [0-9]" | tail -1)
2014-02-27 14:44:27
User: CanOrhan
Functions: cut eval grep tail

Connects to the last adb connection in history.

echo -n "string" | md5sum|cut -f 1 -d " "
2014-02-20 22:44:00
User: labadf
Functions: cut echo

echo defaults to include a newline character at the end of the string, which messes with the hash. If you suppress it with -n then it has the same effect as PHP's ?echo md5("string"), "\t-";? Even more, by using cut you get the exact same output, so it works as a drop-in replacement for the original command for this thread.

udevadm info -q all -n /dev/sdb | grep ID_PATH | cut -d'-' -f 2 | xargs -n 1 lspci -s