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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 echo from sorted by
Terminal - Commands using echo - 1,326 results
scrot -e 'mv $f \$HOME/public_html/shots/; echo "http://\$HOSTNAME/~\$USER/shots/$f" | xsel -i; feh `xsel -o`'
2009-03-26 11:32:09
User: penpen
Functions: echo

A web server using $HOME/public_html as user directory is required, $HOME/public_html/shots must exist and have appropriate access rights and $HOSTNAME must be known to and accessible from the outside world.

The command uses scrot to create a screen shot, moves it to the screen shot directory, uses xsel to copy the URL to the paste buffer (so that you can paste it with a middle click) and finally uses feh to display a preview of the screen shot.

Assign this command to a key combination or an icon in whatever panel you use.

echo "obase=2; 27" | bc -l
2009-03-25 09:54:50
User: polar
Functions: bc echo
Tags: bc

Easily convert numbers to their representations in different bases. Passing

"ibase=16; obase=8; F2A"

to bc will convert F2A (3882 in decimal) from Hex to Octal, and so on.

echo "$math_expr" | bc -l
2009-03-25 09:46:01
User: polar
Functions: bc echo
Tags: bc

Useful for quick calculations at the command line. $math_expr is any arithmetic expression (see sample output):



More options in the bc man page.

echo -e "[client]\nuser = YOURUSERNAME\npassword = YOURPASSWORD" > ~/.my.cnf
2009-03-24 19:05:39
User: alperyilmaz
Functions: echo
Tags: mysql bash

The file .my.cnf located at user's home directory is used for mysql login. If this file exists, then


can be replaced with

mysql database -e 'SOME SQL COMMAND'

It saves you from typing!

This is valid for mysqladmin and mysqldump commands as well.

for i in `find . | grep jar$`; do echo $i; jar tvf $i | grep 'search-string'; done;
alias mux='clear && cd ~/Music/ && ls && echo -n "File> " && read msi && mplayer ~/Music/$msi'
2009-03-23 10:45:27
User: Noxn
Functions: alias cd echo ls read

An alias i made for myself to play music in a faster way.

Works great when you have Guake / Tilda installed (Console that drops down like in the game QUAKE)


I put this in my bash_alias file (I'm on ubuntu, the bash_alias file does autostart with the right config) but it works putting it in bashrc too. Or anything that autostarts when the console is opened.


Needs Mplayer and music files to work. With out music theres nothing to play!

Oh, and also, without modification, this alias will try to play stuff from your ~/Music folder! (case sensitive). Make sure that folder exists and has music OR edit this alias to fit your needs.

ls | while read ITEM; do echo "$ITEM"; done
2009-03-22 23:33:13
User: fletch
Functions: echo ls read
Tags: bash

If you want to operate on a set of items in Bash, and at least one of them contains spaces, the `for` loop isn't going to work the way you might expect. For example, if the current dir has two files, named "file" and "file 2", this would loop 3 times (once each for "file", "file", and "2"):

for ITEM in `ls`; do echo "$ITEM"; done

Instead, use a while loop with `read`:

ls | while read ITEM; do echo "$ITEM"; done
for i in {1..15}; do echo $i; done
2009-03-21 23:08:41
User: haivu
Functions: echo
Tags: bash

The brace expansion also allows you to count backward:

for i in {15..1}; do echo $i; done

You can also use this construct to create new file or new directory:

mkdir dir{1..3} # Same as mkdir dir1 dir2 dir3

ls -1 static/images/ | while read line; do echo -n $line' '[; grep -rc $line *|grep -v ".svn"|cut -d":" -f2|grep -vc 0| tr "\n" -d; echo -n ]; echo ; done
2009-03-20 20:33:36
User: psytek
Functions: cut echo grep ls read tr

This command will grep the entire directory looking for any files containing the list of files. This is useful for cleaning out your project of old static files that are no longer in use. Also ignores .svn directories for accurate counts. Replace 'static/images/' with the directory containing the files you want to search for.

echo ${file##*/}
if [ "${vote}" = "down" ]; then echo leave comment; fi
2009-03-20 00:31:13
Functions: echo

I think it would be wise if anyone voting down left a comment indicating the reason for that action. Don't keep it to yourself. Thanks.

( IFS=:; for p in $PATH; do echo $p; done )
2009-03-19 22:45:47
User: haivu
Functions: echo
Tags: bash

The output of "echo $PATH" is hard to read, this is much easier. The parentheses ensure that the change to the input field separator (IFS) only happens the the sub shell and not affecting the current shell.

echo 'loginname ALL=(ALL) ALL' >> /etc/sudoers
2009-03-19 13:23:43
User: refrax
Functions: echo

I am new to linux, and I was trying to figure out why I could not sudo with my username in Fedora 10. This command, when run as root, will add a line to the sudoers file allowing the loginname supplied to sudo. The above line will require a password when you sudo, if you wish to sudo without password, use:

echo 'loginname ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers

instead. you have to run this command as su, and this is just an easier way of using visudo, just adds it right from the terminal.

echo "- - -" > /sys/class/scsi_host/host0/scan
2009-03-18 15:26:42
User: angrox
Functions: echo

Issues a scan command on the given scsi host adapter (ex. a fibre channel adapter, in the example above on host0). Output can be watched in the messages log or in "dmesg"

echo '123/7' |bc -l |xargs printf "%.3f\n"
echo -n 'text to be encrypted' | openssl md5
2009-03-18 00:11:46
User: Zenexer
Functions: echo

Thanks to OpenSSL, you can quickly and easily generate MD5 hashes for your passwords.

Alternative (thanks to linuxrawkstar and atoponce):

echo -n 'text to be encrypted' | md5sum -

Note that the above method does not utlise OpenSSL.

echo "test" | lp -d $PRINTER
2009-03-17 20:07:41
User: nauseaboy
Functions: echo lp

This will send a test print job to a networked printer.

for i in `find /sys/devices/*/*/usb* -name level` ; do echo -n "$i: " ; cat $i ; done
echo "encryptedpassword"|openssl passwd -1 -stdin
for name in larry moe schemp; do useradd $name; echo 'password' | passwd --stdin $name; chage -d 0 $name; done
2009-03-15 12:02:39
User: atoponce
Functions: chage echo passwd useradd

This command is a bit Linux specific, as --stdin doesn't exist for passwd on many Unix machines. Further, useradd is high level in most distributions and Unix derivatives except for the Debian family of distros, where adduser would be more appropriate. The last bit, with chage, will force the user to change their password on new login.

for i in $(seq 0 5) ; do echo "5 - $i" | bc -l ; sleep 60 ; done && echo "bye, bye" && shutdown -h now
2009-03-13 12:16:35
User: arctarus
Functions: bc echo seq shutdown sleep

command to turn off your computer when you go home and can not wait

echo -n $HEXBYTES | xxd -r -p | dd of=$FILE seek=$((0x$OFFSET)) bs=1 conv=notrunc
2009-03-11 17:02:24
User: zombiedeity
Functions: dd echo

Replace (as opposed to insert) hex opcodes, data, breakpoints, etc. without opening a hex editor.

HEXBYTES contains the hex you want to inject in ascii form (e.g. 31c0)

OFFSET is the hex offset (e.g. 49cf) into the binary FILE

find . -name *DS_Store -exec echo rm {} \;
2009-03-11 11:30:55
User: dgomes
Functions: echo find rm

This is quite usefull in Unix system share via NFS or AppleTalk with OSX clients that like to populate your filesystem with these pesky files

echo -n "string" | md5sum -
2009-03-10 21:01:36
User: cryptema
Functions: echo md5sum

A useful way to generate the MD5 hash for a string by command line

echo "\"\e[5~\": history-search-backward" >> ~/.inputrc
2009-03-10 15:32:52
User: silbermm
Functions: echo

What this does is, if I type ?ssh ? then hit the page-up key, it will complete the line to the last time in my history file that I typed ssh. Hitting page up again will go to the 2nd to last time I typed it. Incredibly handy if you ever type the same commands more than once.

credit goes to http://www.sharms.org/blog/2009/03/10/make-your-bash-shell-cool-again/

echo "\"\e[6~\": history-search-forward" >> ~/.inputrc