What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. 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.

If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.

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:



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



Commands by bugmenot from sorted by
Terminal - Commands by bugmenot - 54 results
ps -eo pmem,comm | grep java | awk '{sum+=$1} END {print sum " % of RAM"}'
2016-02-10 09:00:56
User: bugmenot
Functions: awk grep ps sum

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.

sudo system-image-cli --switch ubuntu-touch/rc-proposed/ubuntu --build 0
2016-02-07 18:24:28
User: bugmenot
Functions: sudo
Tags: ubuntu-phone

Get the latest and hopefully greatest to test out on the Ubuntu Phone - sometimes broken but always interesting. https://developer.ubuntu.com/en/start/ubuntu-for-devices/image-channels/

sudo mount -o remount,rw /
2016-02-07 17:57:19
User: bugmenot
Functions: mount sudo

Warning this will allow you to write to the system image on the phone, not recommended. But sometimes useful.

gsettings reset com.canonical.Unity.Dash favorite-scopes
2016-02-07 17:50:19
User: bugmenot
Functions: reset

To fix this bug: https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1389698

wget https://open.uappexplorer.com/api/download/openstore.mzanetti/openstore.mzanetti_*_armhf.click && pkcon install-local --allow-untrusted openstore.mzanetti_*_armhf.click
2016-02-04 14:24:46
User: bugmenot
Functions: wget

This will download and install the latest version of the open store on the ubuntu phone, this store includes unconfined applications such as the TweakGeek and the Ubuntu Touch Tweak Tool. You can see the install instructions from here: https://open.uappexplorer.com/docs#install

npm list -g --depth 0
awk '{ total += gsub(/yourstring/,"") } END { print total }' yourfile
2014-12-16 21:00:45
User: bugmenot
Functions: awk

Count how many times a pattern is present into a file. It can be one or more lines. No overlapping. It means searching for aa on aaa will output 1 not 2.

echo something | awk '{ total += gsub(/yourstring/,"") } END { print total }'
2014-12-16 20:58:42
User: bugmenot
Functions: awk echo

Count how many times a pattern is present into a stream. It can be one or more lines. No overlapping. It means searching for aa on aaa will output 1 not 2.

for i in {0..255} ; do (ping 192.168.1.$i -c 1 > /dev/null && echo "192.168.1.$i" & ) ; done
2014-01-26 18:31:34
User: bugmenot
Functions: echo ping

Pings all the hosts on in parallel, so it is very fast. Alive host IP addresses are echoed to stdout as pings are responded to.

find /Applications -path '*Contents/_MASReceipt/receipt' -maxdepth 4 -print |sed 's#.app/Contents/_MASReceipt/receipt#.app#g; s#/Applications/##'
2013-09-28 15:44:32
User: bugmenot
Functions: find sed

Shows the OS X applications downloaded from App Store. Doesn't include manually added apps.

curl -s $1 | grep -o -i '<a href="//images.4chan.org/[^>]*>' | sed -r 's%.*"//([^"]*)".*%\1%' | xargs wget
2013-07-22 10:33:55
User: bugmenot
Functions: grep xargs

first grep all href images then sed the url part then wget

convert infile.png \( +clone -channel GB -evaluate set 0 +channel \) +append -region 50%x100% -channel R -evaluate set 0 +channel outfile.png
2013-04-30 20:46:02
User: bugmenot
Functions: set

Converts red-cyan 3D anaglyphs to side-by-side format viewable by crossing your eyes. Useful for people who don't have 3D glasses or prefer not to use one.

cat somefile | tee >(openssl md5 > sum.md5) | bzip2 > somefile.bz2
copy /b part.1 + part.2 + part.n file.extension
cat list.txt | pax -wd > archive.tar
cat /dev/zero | pv -L 3m -Ss 100m > /dev/null
2012-12-15 10:17:52
User: bugmenot
Functions: cat

This example will close the pipe after transferring 100MB at a speed of 3MB per second.

lftp -u user,pass ftp://site.com -e 'pget -c -n 6 file'
2012-12-11 16:18:52
User: bugmenot
Functions: lftp

This is for files only, for directories 'mirror' has to be used.

for line in `wget --referer='http://500px.com/' --quiet -O- http://500px.com/popular | grep "from=popular" | sed -n 's/.*<img src="\([^"]*\)".*/\1/p' | sed s/"3.jpg"/"4.jpg"/ | sed s/"?t".*$//`; do wget -O $RANDOM.jpg --quiet "$line"; done
2012-12-07 16:14:36
User: bugmenot
Functions: grep sed

This command downloads the actual 20 most popular pictures from the website 500px. It uses a random name due to the fact the the pictures in 500px are stored with the same name.

UPDATED: doesn't work if no referrer is specified: --referer='http://500px.com/'

lftp -u user,pass ftp://site.com/ -e 'mirror -c --parallel=3 --use-pget-n=5 "Some folder"'
2012-11-24 11:29:48
User: bugmenot
Functions: lftp

It works best if you first login and then do the fetch:

lftp -u user,pass ftp://site.com/

mirror -c --parallel=3 --use-pget-n=5 "Some folder"

star -c -v -f myarchive.tar -no-dirslash list=list.txt
sed -e "s,/\+$,," -e "s,^/\+,," file.txt
2012-11-02 21:08:30
User: bugmenot
Functions: sed

There can be more than one trailing slash, all of them will be removed.

cat file.txt | grep -v /$ > newfile.txt
dd if=mybackup.ab bs=24 skip=1 | openssl zlib -d > mybackup.tar
dd.exe --progress if=\\.\Volume{0b1a0cbe-11da-11c0-ab53-003045c00008} of=pendrive.img
2012-10-13 08:25:48
User: bugmenot
Functions: dd

Blocksize (bs) is not mandatory. It's only needed when the count option is specified.