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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Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Using commandoutput as a file descriptor

Description is moved to "Sample output" because the html sanitizer for commandlinefu breaks the examples..

Get a metascore from metacritic.com

This will fetch a metascore from metacritic.com. It requires a url from metacritic without the http://www.metacritic.com/ Example: $ metascore games/platforms/wii/supermariogalaxy - $ metascore tv/shows/marriageref - $ metascore video/titles/newmoon Would be cool to use this in some sort of a graph.

repeat a command every one second

Short method of "while x=0; do foo ; sleep 1 ; done"

Dump an aspell dictionary as a word list

Mark packages installed with build-dep for autoremove (on Debian/Ubuntu)

Replace PACKAGE with desired package name. Found here: http://mikebeach.org/2011/04/undo-apt-get-build-dep/

Copy structure

Copies a dir structure without the files in it.

Updated top ten memory utilizing processes (child/instance aggregation) now with percentages of total RAM

Prints the top 10 memory consuming processes (with children and instances aggregated) sorted by total RSS and calculates the percentage of total RAM each uses. Please note that since RSS can include shared libraries it is possible for the percentages to add up to more that the total amount of RAM, but this still gives you a pretty good idea. Also note that this does not work with the mawk version of awk, but it works fine with GNU Awk which is on most Linux systems. It also does not work on OS X.

Apply fade effect to a audio

fade [type] fade-in-length [stop-time [fade-out-length]] Apply a fade effect to the beginning, end, or both of the audio. An optional type can be specified to select the shape of the fade curve: q for quarter of a sine wave, h for half a sine wave, t for linear (`triangular') slope, l for logarithmic, and p for inverted parabola. The default is logarithmic. A fade-in starts from the first sample and ramps the signal level from 0 to full volume over fade-in-length sec? onds. Specify 0 seconds if no fade-in is wanted. For fade-outs, the audio will be truncated at stop-time and the signal level will be ramped from full volume down to 0 starting at fade-out-length seconds before the stop-time. If fade-out-length is not specified, it defaults to the same value as fade-in-length. No fade-out is performed if stop-time is not specified. If the file length can be determined from the input file header and length-changing effects are not in effect, then 0 may be specified for stop-time to indicate the usual case of a fade-out that ends at the end of the input audio stream. All times can be specified in either periods of time or sample counts. To specify time periods use the format hh:mm:ss.frac format. To specify using sample counts, specify the number of samples and append the letter `s' to the sample count (for example `8000s').

ISO info

Get details about an ISO image , without burning it or mounting it .

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Commands using echo (1,545)

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