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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.


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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!
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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:

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Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

All commands from sorted by
Terminal - All commands - 12,393 results
curl ifconfig.me
du -b --max-depth 1 | sort -nr | perl -pe 's{([0-9]+)}{sprintf "%.1f%s", $1>=2**30? ($1/2**30, "G"): $1>=2**20? ($1/2**20, "M"): $1>=2**10? ($1/2**10, "K"): ($1, "")}e'
ssh [email protected] "rpm -qa" | xargs yum -y install
lsmod | perl -e 'print "digraph \"lsmod\" {";<>;while(<>){@_=split/\s+/; print "\"$_[0]\" -> \"$_\"\n" for split/,/,$_[3]}print "}"' | dot -Tpng | display -
2011-11-27 14:02:35
User: bandie91
Functions: dot lsmod perl
35

parse `lsmod' output and pass to `dot' drawing utility then finally pass it to an image viewer

wget http://www.youtube.com/watch?v=dQw4w9WgXcQ -qO- | sed -n "/fmt_url_map/{s/[\'\"\|]/\n/g;p}" | sed -n '/^fmt_url_map/,/videoplayback/p' | sed -e :a -e '$q;N;5,$D;ba' | tr -d '\n' | sed -e 's/\(.*\),\(.\)\{1,3\}/\1/' | wget -i - -O surprise.flv
2011-01-25 04:19:06
User: Eno
Functions: sed tr wget
35

Nothing special required, just wget, sed & tr!

watch -n 1 'echo "obase=2;`date +%s`" | bc'
lsof -i tcp:80
2009-04-16 14:51:53
User: ar_levi
35

Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do !

leave +15
2009-03-13 06:09:52
User: haivu
Tags: PIM
35

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

wget -r -l1 --no-parent -nH -nd -P/tmp -A".gif,.jpg" http://example.com/images
2009-01-27 17:31:22
User: root
Functions: wget
35

This recursively downloads all images from a given website to your /tmp directory. The -nH and -nd switches disable downloading of the directory structure.

for I in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $I | gzip > "$I.sql.gz"; done
mkdir -p work/{d1,d2}/{src,bin,bak}
cp /work/host/phone/ui/main.cpp !#$:s/host/target
2011-09-20 06:48:07
User: kev
Functions: cp
Tags: !!
33

expand to:

cp /work/host/phone/ui/main.cpp /work/target/phone/ui/main.cpp

!#

The entire command line typed so far.

grep ^Dirty /proc/meminfo
2011-08-24 08:48:49
User: h3xx
Functions: grep
33

Ever ask yourself "How much data would be lost if I pressed the reset button?"

Scary, isn't it?

echo "tee can split a pipe in two"|tee >(rev) >(tr ' ' '_')
2010-08-14 20:38:59
User: axelabs
Functions: echo tee tr
33

Tee can be used to split a pipe into multiple streams for one or more process to work it. You can add more " >()" for even more fun.

dig +short myip.opendns.com @resolver1.opendns.com
2010-04-02 21:53:26
User: dooblem
Functions: dig
33

Instead of opening your browser, googling "whatismyip"...

Also useful for scripts.

dig can be found in the dnsutils package.

knock <host> 3000 4000 5000 && ssh -p <port> [email protected] && knock <host> 5000 4000 3000
2009-07-28 14:08:01
User: din7
Functions: ssh
33

Knock on ports to open a port to a service (ssh for example) and knock again to close the port. You have to install knockd.

See example config file below.

[options]

logfile = /var/log/knockd.log

[openSSH]

sequence = 3000,4000,5000

seq_timeout = 5

command = /sbin/iptables -A INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT

tcpflags = syn

[closeSSH]

sequence = 5000,4000,3000

seq_timeout = 5

command = /sbin/iptables -D INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT

tcpflags = syn

export HISTTIMEFORMAT="%F %T "
2009-05-12 14:36:42
User: fritz_monroe
Functions: export
33

History usually only gives the command number and the command. This will add a timestamp to the history file.

Note: this will only put the correct timestamp on commands used after the export is done. You may want to put this in your .bashrc

find . -name "*.[ch]" -exec grep -i -H "search pharse" {} \;
2009-05-06 15:22:49
User: bunedoggle
Functions: find grep
Tags: find grep
33

I have a bash alias for this command line and find it useful for searching C code for error messages.

The -H tells grep to print the filename. you can omit the -i to match the case exactly or keep the -i for case-insensitive matching.

This find command find all .c and .h files

find ./ -type f -exec chmod 644 {} \;
:<C-R><C-W>
2009-04-08 21:25:06
User: pyrho
Tags: vim
33

Very handy to bring the word currently under the cursor into a :s command in Vim.

Example:

If the cursor was on the word "eggs":

:s/ ==> :s/eggs

youtube-dl -t --extract-audio --audio-format mp3 YOUTUBE_URL_HERE
2011-11-15 20:11:20
User: menachem
Tags: youtube mp3
32

youtube-dl has this functionality built in. If you're running an older version of youtube-dl, you can update it using `youtube-dl -U` (although if you have an older version, it probably doesn't download youtube videos anyway.)

youtube-dl --help will show you other options that may come in useful.

find . -type f -newermt "2010-01-01" ! -newermt "2010-06-01"
2011-06-26 09:52:26
User: flatcap
Functions: find
Tags: find dates
32

Find files in a specific date range - in this case, the first half of last year.

-newermt = modification time of the file is more recent than this date

GNU find allows any date specfication that GNU date would accept, e.g.

find . -type f -newermt "3 years ago" ! -newermt "2 years ago"

or

find . -type f -newermt "last monday"
diff <(cd dir1 && find | sort) <(cd dir2 && find | sort)
2009-05-21 04:44:29
User: mbirk
Functions: cd diff find
Tags: bash diff find
32

This uses Bash's "process substitution" feature to compare (using diff) the output of two different process pipelines.

sudo find / -mmin 60 -type f
2009-03-01 23:03:31
User: atoponce
Functions: find sudo
32

Useful mainly for debugging or troubleshooting an application or system, such as X11, Apache, Bind, DHCP and others. Another useful switch that can be combined with -mmin, -mtime and so forth is -daystart. For example, to find files that were modified in the /etc directory only yesterday:

sudo find /etc -daystart -mtime 1 -type f
mkfifo /tmp/fifo; cat /tmp/fifo | nc -l -p 1234 | tee -a to.log | nc machine port | tee -a from.log > /tmp/fifo
2009-02-20 04:00:15
User: prutser
Functions: cat mkfifo tee
32

Forwards localhost:1234 to machine:port, running all data through your chain of piped commands. The above command logs inbound and outbound traffic to two files.

Tip: replace tee with sed to manipulate the data in real time (use "sed -e 's/400 Bad Request/200 OK/'" to tweak a web server's responses ;-) Limitless possibilities.