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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

All commands from sorted by
Terminal - All commands - 12,392 results
convert example.png -resize 100x100 output.png
2010-08-08 16:40:21
User: dbbolton

You can also specify width and height of the resized image (in pixels), as an alternative to using a percentage.

find . -name "*.png" | tee images.txt | grep book
2011-06-02 23:55:50
Functions: find grep tee

You can find every file with png extension and redirect its output to file. Later you can find a string inside the file.

cp -dpRx /* /mnt/target/
2011-08-22 14:22:01
Functions: cp

preserve all except context and xattr. useful when moving a running system to a new partition.

vgdisplay -v 2>/dev/null | grep "^ LV Name" | while read A B LVDEV; do echo $LVDEV; done
NFSPATH=/mountpoint TIMEOUT=5; perl -e "alarm $TIMEOUT; exec @ARGV" "test -d $NFSPATH" || (umount -fl $NFSPATH; mount $NFSPATH)
2010-06-04 07:58:53
User: keymon
Functions: mount perl umount

Based on the execute with timeout command in this site.

A more complex script:


# This script will check the avaliability of a list of NFS mount point,

# forcing a remount of those that do not respond in 5 seconds.


# It basically does this:

# NFSPATH=/mountpoint TIMEOUT=5; perl -e "alarm $TIMEOUT; exec @ARGV" "test -d $NFSPATH" || (umount -fl $NFSPATH; mount $NFSPATH)



SCRIPT_NAME=$(basename $0)

for i in $@; do

echo "Checking $i..."

if ! perl -e "alarm $TIMEOUT; exec @ARGV" "test -d $i" > /dev/null 2>&1; then

echo "$SCRIPT_NAME: $i is failing with retcode $?."1>&2

echo "$SCRIPT_NAME: Submmiting umount -fl $i" 1>&2

umount -fl $i;

echo "$SCRIPT_NAME: Submmiting mount $i" 1>&2

mount $i;



cat /etc/passwd | wc -l
iostat -En $(iostat -en|grep c#t|awk '$2 > 0 {print $NF}')
2011-12-09 15:54:28
Functions: awk grep

This helps quickly get information for each disk that is seemingly having hardware issues.

2009-03-25 07:25:33
User: dizzgo
Tags: Ubuntu

release upgrades are major upgrades as from 8.04 to 8.10 or from 8.10 to 9.04

update-manager-core must be installed:

sudo apt-get install update-manager-core

in some cases you must edit '/etc/update-manager/release-upgrades' and set 'Prompt=normal'

recoll -t -q "keyword" | grep message/rfc822 | sed -s 's,^.*\('$MAILDIR'[^]]*\)\].*$,\"\1\",' | xargs ln -sft $MAILDIR/bingo/cur/
ls -d */* | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs mv -t $(pwd)
2010-03-01 23:43:26
User: leovailati
Functions: ls mv sed xargs

You WILL have problems if the files have the same name.

Use cases: consolidate music library and unify photos (especially if your camera separates images by dates).

After running the command and verifying if there was no name issues, you can use

ls -d */ | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs rm -r

to remove now empty subdirectories.

dc -e "1 1 + p"
ff() { find -maxdepth 3 -type f -iname "$1"; }; fd() { find -maxdepth 4 -type d -iname "$1"; }
2012-08-15 15:04:48
User: plasticboy
Functions: find
Tags: find simple

These should be a little faster since they don't have to spawn grep.

gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=merged.pdf -dBATCH `ls | grep foo`
perl -e 'print 1+1 ."\n";'
echo | socat -u - file:/tmp/swapfile,create,largefile,seek=10000000000000
find ~/.thunderbird/*.default/ -name *.msf | sed 's/ /\\ /g' | xargs rm {} \;
2010-06-04 12:35:24
User: allrightname
Functions: find rm sed xargs

The thunderbird message datastores get corrupt some times causing random failures, compaction to fail and general suck in thunderbird. Removing them causes thunderbird to rebuild the indexes and makes things quick again.

fdupes -rdN $folder
openssl pkcs8 -inform DER -nocrypt -in [priv key] -out [pem priv key]
eval $(curl -s http://www.commandlinefu.com/commands/matching/external/ZXh0ZXJuYWw=/sort-by-votes/plaintext|sed -n '/^# Get your external IP address$/{n;p;q}')
2009-11-04 16:58:31
User: jgc
Functions: eval sed

This command uses the top voted "Get your external IP" command from commandlinefu.com to get your external IP address.

Use this and you will always be using the communities favourite command.

This is a tongue-in-cheek entry and not recommended for actual usage.

PATH="${PATH}:$(find ${HOME}/bin -type d | tr '\n' ':' | sed 's/:$//')"
2013-06-19 19:22:06
User: malathion
Tags: $PATH

Many users have a personal ~/bin folder for user scripts and other miscellaneous applications they can't or don't want to add to /usr/bin. But this folder can get large and unwieldy. The above command adds ~/bin and all its subdirectories to the PATH environment variable so the scripts can be organized without changing .bashrc.

openssl ans1parse -inform DER < [priv key]
2009-02-05 16:54:19
User: wwest4

a pkcs8 key will have integer 00 at offset 4 and an rsaEncryption object at offset 9

defaults write com.apple.finder NSUserKeyEquivalents -dict 'New Finder Window' '@$N' 'New Folder' [email protected]'; killall Finder
2009-02-17 23:20:53
User: Vulpine
Functions: killall write

In Mac OS 9, the "New Folder" keyboard shortcut was Command+N, but in Mac OS X this was changed to "New Finder Window" instead, with "New Folder" taking the more awkward shortcut of Command+Shift+N. This command reverses their mappings.

find -name ".php" -exec perl -pi -e 's/search/replace/g/' {} \;
git push origin --all
awk "/<xsd:annotation>/{h=1};!h;/<\/xsd:annotation>/{h=0}" annotatedSchema.xsd
2011-07-15 07:17:17
User: 2chg
Functions: awk
Tags: xml filter

Removes all lines between the lines containing "" and "", including these lines itself


Sometimes when working with XML files without an graphical editor, large comment-/annotation-blocks taper the readability to walk through the file. I like to create a copy of such documents without these annotations. As the documentation itself is in documentation tags inside the annotation tags an therefore graphical editors tend to put the annotation tags in their own lines, this command removes all documentations within annotation-tags.