Commands using echo sorted by votes

Commands using echo (1,545)

sorted by

Process each item with multiple commands (in while loop)
This is sample output - yours may be different.
-2

find -maxdepth 1 -type d | while read dir; do echo $dir; echo cmd2; done

techie · 2013-04-29 10:15:13 6
get a random number in bash

use it to stagger cronjob or to get a random number increase the range by replacing 100 with your own max value Show Sample Output
This is sample output - yours may be different.
```
bash-4.1$ echo $[RANDOM % 100]
89
```
-2

echo $[RANDOM % 100] # range 0-99

anapsix · 2013-05-25 19:02:00 9
One command line web server on port 80 using nc (netcat)

-k, --keep-open will keep connection alive, and we could exclude using 'while true' nc is such a powerful command, it could be used instead of any OS! :p Show Sample Output
This is sample output - yours may be different.
```
/home/me> curl -i localhost:5432
HTTP/1.1 200 OK
Tue Nov 12 15:40:27 EET 2013


<p>How are you today?</p>
```
-2

nc -kl 5432 -c 'echo -e "HTTP/1.1 200 OK\r\n$(date)\r\n\r\n";echo "<p>How are you today?</p>"'

gvitalie · 2013-11-12 14:00:11 7
Programmatically partition a new disk with fdisk
This is sample output - yours may be different.
-2

(echo n; echo p; echo 3; echo 1; echo; echo; echo w; echo q) | /sbin/fdisk /dev/sda

tsener · 2014-12-04 14:57:28 9
repeat any string or char n times without spaces between
This is sample output - yours may be different.
-2

echo -e $_{1..80}'\b+'

unixmonkey74668 · 2015-05-09 10:04:44 10
Reset the last modified time for each file in a git repo to its last commit time
This is sample output - yours may be different.
-2

for file in $( git ls-files ); do echo $file; touch -t $(git --no-pager log --date=local -1 --format="%ct" $file | php -r 'echo @date( "YmdHi.s", trim( file_get_contents( "php://stdin" ) ) );') $file; done

westonruter · 2015-07-01 00:28:06 13
Muestra el crecimiento de un archivo por segundo

Muestra el crecimiento de un archivo por segundo. Cambia el texto "FILE" por el nombre del archivo a monitorear. Comando STAT
This is sample output - yours may be different.
-2

while true; do A=$(stat -c%s FILE); sleep 1; B=$(stat -c%s FILE); echo -en "\r"$(($B-$A))" Bps"; done

Zort · 2016-06-27 20:39:06 15
Flush memory cache
This is sample output - yours may be different.
-2

free && sync && echo 3 > /proc/sys/vm/drop_caches && free

ironmarc · 2016-11-02 08:51:01 23
loop files with SPACES on their names

use '*' instead of 'ls'
This is sample output - yours may be different.
-2

for f in *;do echo $f;done

famaral · 2018-09-21 14:27:23 365
small CPU benchmark with PI, bc and time.

Broken in two parts, first get the number of cores with cat /proc/cpuinfo |grep proc|wc -l and create a integer sequence with that number (xargs seq), then have GNU parallel loop that many times over the given command. Cheers! Show Sample Output
This is sample output - yours may be different.
```
...
66983895228684783123552658213144957685726243344189303968642624341077\
3226978028073189154411010446823252716201052652272111660396

real	0m31,847s
user	0m59,085s
sys	0m0,151s
```
-2

time cat /proc/cpuinfo |grep proc|wc -l|xargs seq|parallel -N 0 echo "scale=4000\; a$1$\*4" '|' bc -l

kostis · 2018-12-06 05:15:24 674
Hiding ur evil intent! Shame on you!

as a shell script, the possibilities are endless... #!/bin/bash echo doing something very evil! exit [2Aecho doing something very nice! Show Sample Output
This is sample output - yours may be different.
```
$ doing something very nice!
```
-2

echo 'doing something very evil' >/dev/null && echo doing something very nice!

LyscmdFUer · 2019-09-20 12:47:19 101
declare variable as integer
This is sample output - yours may be different.
-3

declare -i aa ; aa=3*8 ; echo $aa

jcgam69 · 2009-02-24 21:58:13 5
Removes Apple "garbage"

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
This is sample output - yours may be different.
-3

find . -name *DS_Store -exec echo rm {} \;

dgomes · 2009-03-11 11:30:55 9
find a class or file within a number of jar files
This is sample output - yours may be different.
-3

for i in `find . | grep jar$`; do echo $i; jar tvf $i | grep 'search-string'; done;

thisduck · 2009-03-23 16:18:26 6
use a literal bang (exclamation point) in a command

Seems obvious, but other seemingly simple ways to use it don't work: echo !whammy and echo "!whammy" both output: -bash: !whammy: event not found and this: echo "\!whammy" outputs: \!whammy with the slash :( you can also do any combinations of quotes for a complex string: echo "It's great to be able to use a bang ("'!'") in a command"'!' outputs: It's great to be able to use a bang (!) in a command! Show Sample Output
This is sample output - yours may be different.
```
!whammy
```
-3

echo '!'whammy

sudopeople · 2009-03-26 23:34:33 9
Print out "string" between "match1" and "match2"

But who knows to delete the rest of the lines? I want only "string".
This is sample output - yours may be different.
-3

echo "string" | sed -e 's/.*match1//' -e 's/match2.*$//'

P17 · 2009-04-01 15:01:27 8
Join lines
This is sample output - yours may be different.
-3

echo -e "aa\nbb\ncc\ndd\n123" | sed -e :a -e "/$/N; s/\n/;/; ta"

unixmonkey3251 · 2009-04-15 16:12:00 7
Encoding with base64

Also works with files: cat file Hello world base64 file SGVsbG8gd29ybGQK To decrypt use the -d option: echo SGVsbG8gd29ybGQK | base64 -d Hello world Show Sample Output
This is sample output - yours may be different.
```
SGVsbG8gd29ybGQK
```
-3

echo "Hello world" | base64

P17 · 2009-04-27 15:00:08 16
Alternative size (human readable) of directories (biggest last)

Found this one little more for me. This one removes the perl dependency (from command 2535). Source for command : http://www.earthinfo.org/linux-disk-usage-sorted-by-size-and-human-readable/ Show Sample Output
This is sample output - yours may be different.
```
/usr/share/compiz $ duf *
4k	text.xml
8k	video.xml
12k	session.xml
40k	colorfilter.xml
92k	staticswitcher.xml
184k	shift.xml
356k	animation.xml
1M	reflection.png
```
-3

function duf { du -sk "$@" | sort -n | while read size fname; do for unit in k M G T P E Z Y; do if [ $size -lt 1024 ]; then echo -e "${size}${unit}\t${fname}"; break; fi; size=$((size/1024)); done; done; }

marssi · 2009-07-02 19:56:36 6
Copy with progress
This is sample output - yours may be different.
-3

copy(){ cp -v "$1" "$2"&watch -n 1 'du -h "$1" "$2";printf "%s%%\n" $(echo `du -h "$2"|cut -dG -f1`/0.`du -h "$1"|cut -dG -f1`|bc)';}

frozenfire · 2009-08-03 14:32:32 11
Get internal and external IP addresses

Gets the internal and external IP addresses of all your interfaces, or the ones given as arguments Show Sample Output
This is sample output - yours may be different.
```
nathan@lion:~$ ips
lo   127.0.0.1      127.0.0.1
eth0 192.168.1.2    80.106.232.129
nathan@lion:~$ ips eth0
eth0 192.168.1.2    80.106.232.129
```
-3

ips(){ for if in ${1:-$(ip link list|grep '^.: '|cut -d\ -f2|cut -d: -f1)};do cur=$(ifconfig $if|grep "inet addr"|sed 's/.*inet addr:$[0-9\.]*$.*/\1/g');printf '%-5s%-15s%-15s\n' $if $cur $(nc -s $cur sine.cluenet.org 128 2>/dev/null||echo $cur);done;}

frozenfire · 2009-08-07 10:04:46 3
Testing php configuration

http://localhost/test.php
This is sample output - yours may be different.
-3

echo "<?php phpinfo(); ?>" >> /srv/www/htdocs/test.php

userevolution · 2009-08-11 05:56:25 13
Useful if you need to see compiler errors while edit a code

If you receives a lot of compiling errors, type 'clear', then reedit your code and press "SHIFT+PGUP". Show Sample Output
This is sample output - yours may be different.
```
[marcio@localhost ~]$ alias clear='( for ((i=1;i<$LINES;i++)) ; do echo "" ; done ) ; clear'
[marcio@localhost ~]$ vi tmp.c
[marcio@localhost ~]$ gcc tmp.c 
tmp.c:1: error: parse error before "is"
shell returned 1
[marcio@localhost ~]$ clear
[marcio@localhost ~]$ vi tmp.c
[marcio@localhost ~]$ 
```
-3

alias clear='( for ((i=1;i<$LINES;i++)) ; do echo "" ; done ) ; clear'

Marcio · 2009-10-27 14:38:31 3
Get your external IP address

bash neto..
This is sample output - yours may be different.
-3

exec 3<>/dev/tcp/whatismyip.com/80; echo -e "GET /automation/n09230945.asp HTTP/1.0\r\nHost: whatismyip.com\r\n" >&3; a=( $(cat <&3) ); echo ${a[${#a[*]}-1]};

yaccovs · 2009-11-03 21:57:00 6
mkdir & cd into it as single command

combines mkdir and cd added quotes around $_, thanx to flatcap! Show Sample Output
This is sample output - yours may be different.
```
~/#$ mkcd /path/to/new/folder
/path/to/new/folder#$_
```
-3

echo 'mkcd() { mkdir -p "$@" && cd "$_"; }' >> ~/.bashrc

phaidros · 2010-01-13 09:37:56 4
‹ First < 56 57 58 59 60 > Last ›

What's this?

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

Share Your Commands

Check These Out

Calculate sum of N numbers (Thanks to flatcap)

replaces "\n" with "+"

Print all 256 colors for testing TERM or for a quick reference

This is super fast and an easy way to test your terminal for 256 color support. Unlike alot of info about changing colors in the terminal, this uses the ncurses termcap/terminfo database to determine the escape codes used to generate the colors for a specific TERM. That means you can switch your terminal and then run this to check the real output. $ tset xterm-256color at any rate that is some super lean code! Here it is in function form to stick in your .bash_profile aa_256 () { ( x=`tput op` y=`printf %$((${COLUMNS}-6))s`; for i in {0..256}; do o=00$i; echo -e ${o:${#o}-3:3} `tput setaf $i;tput setab $i`${y// /=}$x; done ) } From my bash_profile: http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

Mostly silent FLAC checking (only errors are displayed)

FLAC's built in integrity checks are far more useful then devising a scheme to use MD5 sum files. This will check all the FLAC in a directory and output only errors. Remove the "s" after the "t" and it will be somewhat verbose in the check.

Clone or rescue a block device

If you use the logfile feature of ddrescue, the data is rescued very efficiently (only the needed blocks are read). Also you can interrupt the rescue at any time and resume it later at the same point. http://www.gnu.org/software/ddrescue/ddrescue.html

delete multiple files with spaces in filenames (with confirmation)

ls -Q will show the filenames in quotes. xargs -p rm will print all the filenames piped from ls -Q and ask for confirmation before deleting the files. without the -Q switch, if we have spaces in names, then the files won't be deleted.

reverse order of file

sort lines by length

making it "sound" more "natural" language like -- additionally sorting the longest words alphabetically: this approach is using: * to get at all lines of input * post-"for" structure * short-circuit-or in sort: if the lengths are the same, then sort alphabetically otherwise don't even evaluate the right hand side of the or * -C sets all input and ouput channels to utf8

copy with progress bar - rsync

-r for recursive (if you want to copy entire directories) src for the source file (or wildcards) dst for the destination --progress to show a progress bar

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

split a multi-page PDF into separate files

Simple alternative to the previous submitted one

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using echo

Commands using echo (1,545) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using echo (1,545)

sorted by