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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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Commands using echo from sorted by
Terminal - Commands using echo - 1,331 results
chage -M -1 root; echo "" > /etc/security/opasswd
2017-07-30 21:26:43
User: tsener
Functions: chage echo

Disable password expiration and clear password history for VMware vcenter appliance

echo "$(obase=16; echo "$(date +%s)" | bc | xxd -r -p | base32)"
echo "http://commandlinefu.com" | curl -F-=\<- qrenco.de
phase() { while :; do for n in E4 F#4 B4 C#5 D5 F#4 E4 C#5 B4 F#4 D5 C#5; do /usr/bin/play -qn synth $1 pluck $n; done; echo -n "[$1]"; done; }; phase 0.13 & phase 0.131 &
2017-06-14 20:29:26
User: rodolfoap
Functions: echo

The Piano Phase piece, by Steve Reich is a minimalist composition which is played on two pianos played at slightly different tempos, a task that's very difficult to accomplish by human players. The auditive effects produced by the cell displacement produce beautiful patterns. See https://en.wikipedia.org/wiki/Piano_Phase . My rendered version: https://ydor.org/SteveReich/piano_phase.mp3

Requires sox to be installed on the system.

There are multiple videos on youtube showing different approaches and experiences to this interpretation. There is also a synthesized version.

Even if Bash can behave as a powerful pianist, a simple threaded version leaves full room to several time glitches and even negative displacements, the same issues that human pianists experience when playing the piece. The older the computer, the better the chaos added to the result due to the CPU load. Apparently that's the reason Steve Reich composes pieces such as this.

Without further ado, please give a warm welcome to the Bash minimalist player on synthesized two-threaded pianos. Please turn off your cellphones.

scrypt(){ [ -n "$1" ]&&{ echo '. <(echo "$(tail -n+2 $0|base64 -d|mcrypt -dq)"); exit;'>$1.scrypt;cat $1|mcrypt|base64 >>$1.scrypt;chmod +x $1.scrypt;};}
2017-06-14 16:27:20
User: rodolfoap
Functions: cat chmod echo

This function will encrypt a bash script and will only execute it after providing the passphrase. Requires mcrypt to be installed on the system.

cat hello


case "$1" in

""|-h) echo "This is the fantastic Hello World. Try this:" $(basename $0) "[entity]" ;;

moon) echo Good night. ;;

sun) echo Good morning. ;;

world) echo "Hello, world!" ;;

*) echo Hi, [email protected] ;;


scrypt hello

Enter the passphrase (maximum of 512 characters)

Please use a combination of upper and lower case letters and numbers.

Enter passphrase:

Enter passphrase:

Stdin was encrypted.

cat hello.scrypt

. <(echo "$(/usr/bin/tail -n+2 $0|base64 -d|mcrypt -dq)");exit;









This is the fantastic Hello World. Try this: hello [entity]


Enter passphrase:

This is the fantastic Hello World. Try this: hello.scrypt [entity]

./hello world

Hello, world!

./hello.scrypt world

Enter passphrase:

Hello, world!

find / -type d | while read i; do ls $i | wc -l | tr -d \\n; echo " -> $i"; done | sort -n
2017-05-12 00:02:43
User: Zort
Functions: echo find ls read sort tr wc

Show file count into directories.

Usefull when you try to find hugh directories that elevate system CPU (vmstat -> sy)

printf "%x\n" $(seq 0 255) | xargs -n1 -IH echo -ne \\xH > test.dat
sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }
2017-03-21 23:31:25
User: pdxdoughnut
Functions: echo printf

Converts any number of seconds into days, hours, minutes and seconds.

sec2dhms() {

declare -i SS="$1"

D=$(( SS / 86400 ))

H=$(( SS % 86400 / 3600 ))

M=$(( SS % 3600 / 60 ))

S=$(( SS % 60 ))

[ "$D" -gt 0 ] && echo -n "${D}:"

[ "$H" -gt 0 ] && printf "%02g:" "$H"

printf "%02g:%02g\n" "$M" "$S"


wait_for_this.sh; echo "wait_for_this.sh finished running" | mail -s "Job Status Update" [email protected]
stf=$(date +%s.%N);for ((;;));do ctf=$( date +%s.%N );echo -en "\r$(date -u -d "0 $ctf sec - $stf sec" "+%H:%M:%S.%N")";done
stf=$(date +%s.%N);st=${stf/.*/};sn=%{stf/*./};for ((;;));do ctf=$( date +%s.%N );ct=${ctf/.*/};cn=${ctf/*./}; dtf=$(echo "scale=3; $ctf-$stf" | bc); dt=${dtf/.*/}; dt=${dt:=0};echo -en "\r$(date -u -d @$dt "+%H:%M:%S.${dtf/*./}")";done
stf=$(date +%s.%N);st=${stf/.*/};sn=%{stf/*./};for ((;;));do ctf=$( date +%s.%N );ct=${ctf/.*/};cn=${ctf/*./}; echo -en "\r$(echo "scale=3; $ctf-$stf" | bc)";done
2017-01-26 13:20:30
User: glaudiston
Functions: date echo
Tags: chronometer

A way for tracking times in bash

free && sync && echo 3 > /proc/sys/vm/drop_caches && free
printf -vl "%${COLUMNS:-`tput cols 2>&-||echo 80`}s\n" && echo ${l// /-};
2016-09-25 10:37:20
User: AskApache
Functions: echo printf

Unlike other methods that use pipes and exec software like tr or sed or subshells, this is an extremely fast way to print a line and will always be able to detect the terminal width or else defaults to 80. It uses bash builtins for printf and echo and works with printf that supports the non-POSIX `-v` option to store result to var instead of printing to stdout.

Here it is in a function that lets you change the line character to use and the length with args, it also supports color escape sequences with the echo -e option.

function L() { local l=; builtin printf -vl "%${2:-${COLUMNS:-`tput cols 2>&-||echo 80`}}s\n" && echo -e "${l// /${1:-=}}"; }

With color:

L "`tput setaf 3`="

1. Use printf to store n space chars followed by a newline to an environment variable "l" where n is local environment variable from $COLUMNS if set, else it will use `tput cols` and if that fails it will default to 80.

2. If printf succeeds then echo `$l` that contains the chars, replacing all blank spaces with "-" (can be changed to anything you want).

From: http://www.askapache.com/linux/bash_profile-functions-advanced-shell.html http://www.askapache.com/linux/bash-power-prompt.html

for y in {1..10}; do for x in {1..10}; do echo -n "| $x*$y=$((y*x)) "; done; echo; done|column -t
2016-09-07 12:31:18
User: lpalgarvio
Functions: column echo

The multiplication table for math study

links $( a=( $( lynx -dump -listonly "http://news.google.com" | grep -Eo "(http|https)://[a-zA-Z0-9./?=_-]*" | grep -v "google.com" | sort | uniq ) ) ; amax=${#a[@]} ; n=$(( `date '+%s'` % $amax )) ; echo ${a[n]} )
2016-07-26 11:52:12
User: pascalv
Functions: echo grep sort uniq

Access a random news web page on the internet.

The Links browser can of course be replaced by Firefox or any modern graphical web browser.

while true; do A=$(stat -c%s FILE); sleep 1; B=$(stat -c%s FILE); echo -en "\r"$(($B-$A))" Bps"; done
2016-06-27 20:39:06
User: Zort
Functions: echo sleep stat

Muestra el crecimiento de un archivo por segundo.

Cambia el texto "FILE" por el nombre del archivo a monitorear.

Comando STAT

while true; do A=$(ls -l FILE | awk '{print $5}'); sleep 1; B=$(ls -l FILE | awk '{print $5}'); echo -en "\r"$(($B-$A))" Bps"; done
2016-06-27 20:33:02
User: Zort
Functions: awk echo ls sleep

Muestra el crecimiento de un archivo por segundo.

Cambia el texto "FILE" por el nombre del archivo a monitorear.

Comando LS + AWK

echo '"\e\C-i": "\C-awhile true; do ( \C-e ); inotifywait -q -e modify -e close_write *; done\e51\C-b"' >>~/.inputrc
2016-06-10 08:06:50
User: unhammer
Functions: echo

Assuming you've written all of

make -j hfst-tokenize && echo doavtter gr?dakursa|./hfst-tokenize --gtd tokeniser-gramcheck-gt-desc.pmhfst

and want that to execute every time you :w in vim (or C-xC-s in Emacs), just hit and it'll turn into

while true; do ( make -j hfst-tokenize && e doavtter gr?dakursa|./hfst-tokenize --gtd tokeniser-gramcheck-gt-desc.pmhfst ); inotifywait -q -e modify -e close_write *; done

with the cursor right before the ')'. Hit enter, and it'll run on each save.

Requires the package inotify-tools installed.

echo "https://www.google.com/maps/place/$(exiftool -ee -p '$gpslatitude, $gpslongitude' -c "%d?%d'%.2f"\" image.jpg 2> /dev/null | sed -e "s/ //g")"
2016-06-09 13:33:10
User: mpb
Functions: echo

This command uses the "exiftool" command which is available here: http://www.sno.phy.queensu.ca/~phil/exiftool/

NB, there should be a degree symbol right after the first "%d" NOT a question mark.

For some unknown reason, commandlinefu is not able to handle degree symbol correctly ("?")?

echo "$USER"|rev | espeak
dir=/rom; a=$(find $dir -name \*.sh -exec cat '{}' \; | egrep -cv '^[[:space:]]*#'); b=$(find $dir -name \*.sh -exec cat '{}' \; | egrep -c '^[[:space:]]*#'); echo $((a+b)) lines = ${a} sloc [$((a*100/(a+b)))%] + ${b} comments [$((b*100/(a+b)))%]
scriptName="reorder_files.sh"; echo -e '#!/bin/sh\n' > "${scriptName}"; cat files.txt | while read file; do echo "touch ${file}; sleep 0.5;" >> "${scriptName}"; done; chmod +x "${scriptName}";
2016-04-19 11:52:00
User: programmer
Functions: cat chmod echo read

Create a bash script to change the modification time for each file in 'files.txt' such that they are in the same order as in 'files.txt'

File name for bash script specified by variable, 'scriptName'. It is made an executable once writing into it has been completed.

touch files.txt; cat reorder_files.sh | while read line; do x=`echo $line | sed 's/touch \([a-z0-9\.]\+.*.pdf\);.*/\1/'`; echo $x >> files.txt ; done;
echo Which way up? | flip.pl | cowsay | tac | sed -e "s,/,+,g" -e "s,\\\,/,g" -e "s,+,\\\,g" -e "s,_,-,g" -e "s,\^,v,g"
2016-04-08 11:41:44
User: mpb
Functions: echo sed tac

It's quite fun to invert text using "flip.pl" (ref: http://ubuntuforums.org/showthread.php?t=2078323 ).

Slightly more challenging is to flip a whole "cowsay". :-)