Commands using echo sorted by votes

Commands using echo (1,545)

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Matched string reference in replacement text

Use matched data and some other as replacement data Show Sample Output
This is sample output - yours may be different.
```
$ echo "abcde" | sed 's/./& /g'
a b c d e 
```
0

echo "abcde" | sed 's/./& /g'

totti · 2011-08-26 16:54:26 7
Get duration of an audio file in seconds.
This is sample output - yours may be different.
0

get_duration () { IFS=.: read -r _ h m s _ < <(ffmpeg -i "$1" 2>&1 | grep Duration);echo $(( h * 3600 + m * 60 + s )); }

RanyAlbeg · 2011-08-28 15:02:42 5
create file

enter our information on the content file. Show Sample Output
This is sample output - yours may be different.
```
empty
```
0

FILE=$(tempfile 2>/dev/null || echo .$RANDOM)

s123iva · 2011-08-31 10:39:11 3
Generate an XKCD #936 style 4 word passphrase (fast) w/o apostrophes

Fast and excludes words with apostrophes. For ubuntu, you can use wamerican or wbritish dictionaries, installable through aptitude. Show Sample Output
This is sample output - yours may be different.
```
speculation crazies sox heftier
restfuller geneticists overdo Georgina
chaises masseur procurer grab
```
0

echo $(cat /usr/share/dict/words |grep -v "'"|shuf -n4)

d1v3rdown · 2011-08-31 12:48:14 3
Displays All TCP and UDP Connections
This is sample output - yours may be different.
0

sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep udp && echo && sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep tcp

brando56894 · 2011-09-08 18:54:36 3
Hunt for the newest file.
This is sample output - yours may be different.
0

fn=$(find . -type f -printf "%T@\t%p\n"|sort -n|tail -1|cut -f2); echo $(date -r "$fn") "$fn"

tzot · 2011-09-13 14:26:20 3
Remove the last string character using rev and cut

In case sed and awk are not available you may use this to remove the last character from a string with "rev" and "cut". Show Sample Output
This is sample output - yours may be different.
```
command line
```
0

echo "command lines" | rev | cut -c 2- | rev

ztank1013 · 2011-09-21 11:27:52 6
Adding kernel boot parameters after loading kernel and initrd

Then exit from the shell. exit some time need to exit twice exit exit Now the OS will boot with the new parameters.
This is sample output - yours may be different.
0

echo "root=/dev/sda7" > /proc/param.conf

totti · 2011-09-27 18:06:53 5
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

Creates the .ssh directory on the remote host with proper permissions, if it doesnt exist. Appends your public key to authorized_keys, and verifies it has proper permissions. (if it didnt exist it may have been created with undesireable permissions). *Korn shell syntax, may or may not work with bash
This is sample output - yours may be different.
0

ssh <user>@<host> 'mkdir -m 700 ~/.ssh; echo ' $(< ~/.ssh/id_rsa.pub) ' >> ~/.ssh/authorized_keys ; chmod 600 ~/.ssh/authorized_keys'

Halki · 2011-10-03 15:59:43 3
Unmount all CIFS drives

Unmounts all CIFS-based network drives. Very nice for shutting down network mounts on a Linux laptop just prior to going to sleep. Show Sample Output
This is sample output - yours may be different.
```
UNMOUNTING /home/danf/gmounts/G... [DONE]
UNMOUNTING /home/danf/gmounts/H... [DONE]
UNMOUNTING /home/danf/gmounts/N... [DONE]
```
0

for D in `mount -lt cifs | sed 's/.*on $\/.\+$ type.*/\1/'`; do echo -n "UNMOUNTING $D..."; sudo umount $D; echo " [DONE]"; done;

crazedsanity · 2011-10-19 18:14:19 4
Displays what shell you are using.
This is sample output - yours may be different.
0

echo $0

defiantredpill · 2011-10-20 18:10:23 3

view all console fonts

Testing in a TTY terminal , not emulator . Show Sample Output

#!/bin/bash cd /usr/share/consolefonts/; for i in * ; do setfont; echo "testing >> $i << font" ; setfont $i ; showconsolefont ; sleep 5 ; clear ; done

ambagasdowa · 2011-10-25 01:14:48 7

Prevent command history file from being overwritten by multiple shell sessions.

Takes effect immediately.
This is sample output - yours may be different.
0

echo "shopt -s histappend" >> ~/.bashrc ; . ~/.bashrc

dhart · 2011-11-03 09:57:18 3
Knowing when a machine is turned on
This is sample output - yours may be different.
0

date -d @$(echo $(($(date +%s)-$(cat /proc/uptime|cut -d. -f1))))

RuizTapiador · 2011-11-04 12:58:27 4
display list of files in a directory sorted by amount of lines different with original.txt.
This is sample output - yours may be different.
0

for f in $(ls -A ./dir); do echo -n $f && diff original.txt ./dir/$f | wc -l ; done | perl -ne 'my $h={}; while (<>) { chomp; if (/^(\S+?)\s*(\d+?)$/){$h->{$1}=$2;} }; for my $k (sort { $h->{$a} $h->{$b} } keys %$h ){ print "$k\t$h->{$k}\n"}'

1vq9 · 2011-11-15 06:02:12 3
Remove the first and the latest caracter of a string

Just an other solution :)
This is sample output - yours may be different.
0

echo foobar | sed -r 's/(^.|.$)//g'

ebraminio · 2011-11-19 16:19:07 3
Remove dashes in UUID

Remove the dashes from a UUID using bash search and replace. Show Sample Output
This is sample output - yours may be different.
```
63b726a04c5945e4af65bced5d268456
```
0

UUID="63b726a0-4c59-45e4-af65-bced5d268456"; echo ${UUID//-/}

flatcap · 2011-11-22 22:49:30 103
encrypt sensitive image using password

Do not use JPEG, GIF, or any other 'lossy' image encoding with Encryption
This is sample output - yours may be different.
0

read -s PASS; echo $PASS | convert sensitive.jpg -encipher - -depth 8 png24:hidden.png

kev · 2011-11-25 18:15:23 11
histogram of file size

Log scaled histogram so that you can see large files even if there is a single HUGE file in the directory. Also makes sure the histogram is fullscreen for best chance of readable file names.
This is sample output - yours may be different.
0

gnuplot -p <(echo "set terminal wxt size `xrandr|grep -P '\s{3}(\d+x\d+).*\+$'|tr -s ' ' '\t'|cut -f2|sort -n|tail -n1|tr 'x' ','`; set logscale y; set style data hist; set xtic rot by -90; plot '<(stat -c \"%n %s\" *)' u 2:xtic(1)")

MattOates · 2011-11-30 15:14:40 3
check a list of domains registered on godaddy

Found on https://bitcointalk.org/index.php?topic=55520.0
This is sample output - yours may be different.
0

for i in `wget -O url|grep '<a rel="nofollow"'|grep http|sed 's|.*<a rel="nofollow" class="[^"]\+" href="[^"]*https\?://$[^/]\+$[^"]*">[^<]\+</a>.*|\1|'`;do if test -n "$(whois $i|grep -i godaddy)";then echo $i uses GoDaddy;fi;sleep 20;done

coinbitsdotcom · 2011-12-24 19:12:18 5
Get Public IP Address from command line

Check your IP address using www.whatismyip.org from the command line
This is sample output - yours may be different.
0

echo `wget -q -O - http://www.whatismyip.org`

godmachine81 · 2011-12-31 01:37:33 3
Decode \x{ABCD}-style Unicode escape sequences

This is especially useful to get crazy stuff like space characters copied to your pasteboard correctly. Source: https://github.com/mathiasbynens/dotfiles/blob/master/.functions Show Sample Output
This is sample output - yours may be different.
```
$ unidecode "\x{1D306}"
&#119558;
$ unidecode "\x{00A9}\x{2122}\x{00AE}"
???
```
0

perl -e "binmode(STDOUT, ':utf8'); print \"$@\""; echo # newline

mathias · 2012-01-02 10:34:51 6
Fast way to get the product of every number in a file
This is sample output - yours may be different.
0

(sed 's/^/x*=/' file ; echo x) | bc

fallen3angel · 2012-01-03 13:45:25 3
Remove color codes (special characters) with sed

Remove ANSI colors from stream or file
This is sample output - yours may be different.
0

sed -r 's/'$(echo -e "\033")'\[[0-9]{1,2}(;([0-9]{1,2})?)?[mK]//g'

frntn · 2012-01-04 20:57:09 5
Delimiter Hunting

Scan a file and print out a list of ASCII characters that are not used in the file which can then be safely used to delimit fields. Useful when needing to convert CSV files using "," to a single character delimiter. Piping it into less at the end (which could be redundant) stops the command characters being interpreted by the terminal.
This is sample output - yours may be different.
0

for i in `seq 0 9` A B C D E F; do for j in `seq 0 9` A B C D E F; do HEX=\$\'\\x${i}${j}\'; if ! eval grep -qF "$HEX" file; then eval echo $HEX \\x${i}${j}; fi; done; done 2> /dev/null | less

moogmusic · 2012-01-05 10:09:07 29
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Show every subdirectory (zsh)

vim easter egg

inside vim try: :help 42 to get the meaning of life, the universe and everything !

Get the gravatar UTL for a given email address

rgrep: recursive grep without .svn

Only excludes .svn from filenames.

View a file with less, starting at the end of the file

The same as typing 'less filename' then 'G' or '>' or the END key. Comes in handy with shell scripts or aliases: alias weblog='less +G /var/log/httpd/access_log' alias errlog='less +G /var/log/httpd/error_log'

Synthesize text as speech

The Festival Speech Synthesis System converts text into sound. Or: links -dump http://youfavoritewebsite.com | festival --tts

Ping all hosts on 192.168.1.0/24

Will report back IP address's of all hosts that are UP.

Git diff last two commits

How about this one ?

Convert a single-page PDF to a hi-res PNG, at 300dpi

If you skip this part: $ -density 300x300 you'll get a very lo-res image.

Validating a file with checksum

Makes sure the contents of "myfile" are the same contents that the author intended given the author's md5 hash of that file ("c84fa6b830e38ee8a551df61172d53d7").

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Commands using echo (1,545)

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