Commands using echo sorted by votes

Commands using echo (1,545)

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Partition a new disk as all one partition tagged as LINUX_NATIVE

Creates a single primary partition starting at sector 0 and extending to the end of the disk. Use with care.
This is sample output - yours may be different.
0

echo "0,,L" | sfdisk /dev/sdX

twobitsprite · 2012-04-09 18:36:24 5
Matrix Style

A tweak using Patola's code as a base, this full-width green matrix display has all the frills (and all the printable characters). You don't need the surrounding parens if you don't care about losing globbing capabilities. Z-shell (/bin/zsh) needs neither the parens nor the `set -o noglob` Screen shot (animated): http://desmond.imageshack.us/Himg32/scaled.php?server=32&filename=matrixh.gif&res=landing If it's too slow, try lowering the `sleep 0.05` or even replacing it with `true` (which is faster than `sleep 0`). I squashed it as narrow as I could to conserve space, though somebody could probably squeeze a char or two out. Enjoy!
This is sample output - yours may be different.
0

(set -o noglob;while sleep 0.05;do for r in `grep -ao '[[:print:]]' /dev/urandom|head -$((COLUMNS/3))`;do [ $((RANDOM%6)) -le 1 ] && r=\ ;echo -ne "\e[$((RANDOM%7/-6+2));32m $r ";done;echo;done)

adamhotep · 2012-04-13 02:09:10 3
Add a custom package repository to apt sources.list

">>" appends to the file ">" replaces the entire file make sure to use ">>" Show Sample Output
This is sample output - yours may be different.
```
none
```
0

sudo echo "package url" >> /etc/apt/sources.list

Gunni · 2012-05-01 21:32:51 4

Converts the output of disklabel from bytes to Gigabytes on FreeBSD

This was done in csh. Show Sample Output

echo `disklabel mfid1s4 | sed -n '$p' | awk '{print $2}'` / 1024 / 1024 | bc -l

RageJello · 2012-05-04 12:48:58 3

pad file names with zeros so that files sort easily

This command takes a few changes to get to the file format, but once you have that, you're good to go. Set your environment variables and then change the text "front" and "back" to whatever you're files start and end with. You'll end up with some easily sort-able files. Show Sample Output
This is sample output - yours may be different.
```
mv front1back front001back
mv front2back front002back
mv front3back front003back
mv front4back front004back
mv front5back front005back
mv front6back front006back
mv front7back front007back
mv front8back front008back
mv front9back front009back
mv front10back front010back
mv front11back front011back
mv front12back front012back
mv front13back front013back
mv front14back front014back
mv front15back front015back
```
0

zeros=3; from=1; to=15; for foo in $(seq $from $to); do echo mv "front${foo}back" "front$(printf "%0${zeros}d\n" $foo)back"; done

ClashTheBunny · 2012-05-17 10:54:45 4
highlight chars or words in program output

save as shell script and pipe your command output Show Sample Output
This is sample output - yours may be different.
```
#!/bin/zsh
SHL='\\e[0;31m'
EHL='\\e[0m'
while read line; do
  TEXT=$line
  for SSTR in $*; do
    TEXT=$(echo $TEXT | sed -e "s:$SSTR:${SHL}${SSTR}${EHL}:g")
  done
  echo -e $TEXT
done
$ echo foobarbaz | highlight a z
foobarbaz
    ^  ^^
```
0

#!/bin/zsh SHL='\\e[0;31m' EHL='\\e[0m' while read line; do TEXT=$line for SSTR in $*; do TEXT=$(echo $TEXT | sed -e "s:$SSTR:${SHL}${SSTR}${EHL}:g") done echo -e $TEXT done

steigr · 2012-06-06 12:57:50 3
Revert all modified files in an SVN repo

This command allows you to revert every modified file one-by-one in a while loop, but also after "echo $file;" you can do any sort of processing you might want to add before the revert happens. Show Sample Output
This is sample output - yours may be different.
```
my/files.txt
Reverted 'my/files.txt'
```
0

svn status | grep "^M" | while read entry; do file=`echo $entry | awk '{print $2}'`; echo $file; svn revert $file; done

wsams · 2012-06-17 16:01:06 9
Generate a password for website authentication that can be recreated each time you need to authenticate without saving the password

Create a bash function for easy reference webPassword() { echo $1 $2 | md5sum | awk '{print substr($0,0,10)}' } alias webpwd=webPassword Use like this. webpwd www.commandlinefu.com MyPetNameHere Show Sample Output
This is sample output - yours may be different.
```
$ echo http://www.TheWebSiteName.com privatekeyword | md5sum | awk '{print substr($0,0,10)}'

3ac2dd2389
```
0

echo http://www.TheWebSiteName.com privatekeyword | md5sum | awk '{print substr($0,0,10)}'

ertjies · 2012-06-28 11:32:08 3

Show 10 6 characters pass and crypt(3) *if you like

Show Sample Output

SEED=$(head -1 /dev/urandom|od -N 1);for i in {1..10};do tmp=$(mkpasswd ${RANDOM});pass=${tmp:2:6};echo Pass $pass Crypt: $(mkpasswd $pass);done

dzup · 2012-07-07 03:20:46 3

Show crontabs for all users

added echo "### Crontabs for $user ####"; to make clear whose crontab is listed.
This is sample output - yours may be different.
0

for user in $(getent passwd|cut -f1 -d:); do echo "### Crontabs for $user ####"; crontab -u $user -l; done

harpo · 2012-07-11 13:06:17 3
Show crontabs for all users

Show the crontabs of all the users. Show Sample Output
This is sample output - yours may be different.
```
flatcap
        @daily /usr/bin/something

root
        0 0 * * * /root/midnight_script.sh
```
0

for i in /var/spool/cron/*; do echo ${i##*/}; sed 's/^/\t/' $i; echo; done

flatcap · 2012-07-11 13:36:34 8
Make a repeating patterned wallpaper from any image

This command clones an image three times and creates a 'tile' image that can be used for a repeating pattern wallpaper. Add 'rm $f $of $off' to the end for cleanup (command was too long to submit with it). See this link for an example: http://meathive.deviantart.com/art/Easy-Photography-Hack-314846774
This is sample output - yours may be different.
0

goWall() { if [ $# -ne 1 ]; then echo 'goWall image';return;fi;w=w.jpg;o="$1";f="$1"-f;of="$1"-af;off="$1"-aff;convert "$1" -flop $f;montage -geometry +0+0 -tile 2x "$1" $f $of;convert $of -flip $off;montage -geometry +0+0 -tile 1x $of $off $w }

meathive · 2012-07-17 05:01:58 30
Ping sweep without NMAP

This version combines the best of the other suggestions and adds these features: 1. It scans a /16 subnet 2. It is very fast by running the ping commands in the background, running them in parallel. 3. Does not use the "-W" option as that's not available in older ping versions (I needed this for OS X 10.5)
This is sample output - yours may be different.
0

prefix="169.254" && for i in {0..254}; do echo $prefix.$i/8; for j in {1..254}; do sh -c "ping -m 1 -c 1 -t 1 $prefix.$i.$j | grep \"icmp\" &" ; done; done

tempelorg · 2012-07-25 12:07:15 3
Displays all the fields of a table, really usefull to run it inside editor (Emacs or vim)

You can execute this inside an editor to get all the fields inside your buffer and do the magic, really usefull when your tables contain a giant list of fields. Show Sample Output
This is sample output - yours may be different.
```
user@machine:~$ echo "describe information_schema.COLUMNS" | mysql -u root | awk '{print $1}' | grep -v Field
TABLE_CATALOG
TABLE_SCHEMA
TABLE_NAME
COLUMN_NAME
ORDINAL_POSITION
COLUMN_DEFAULT
IS_NULLABLE
DATA_TYPE
CHARACTER_MAXIMUM_LENGTH
CHARACTER_OCTET_LENGTH
NUMERIC_PRECISION
NUMERIC_SCALE
CHARACTER_SET_NAME
COLLATION_NAME
COLUMN_TYPE
COLUMN_KEY
EXTRA
PRIVILEGES
```
0

echo "DESCRIBE dbname.table_name" | mysql -u dbusername | awk '{print $1}' | grep -v Field

adauto · 2012-07-26 21:06:11 3
Remove from PATH paths containing a string

If there are spaces won't work.
This is sample output - yours may be different.
0

export PATH= $(echo $PATH | tr ':' '\n' | awk '!/matching string/' | paste -sd:)

bugmenot · 2012-07-29 00:30:54 3
Escape literal string for inclusion in an egrep regex

Use if you want to include untrusted literal strings in your grep regexes. I use it to list all mounts below a directory: dir=/mnt/gentoo; cat /proc/mounts |awk '{print $2}' |egrep "^$(egrep_escape "$dir")(/|$)" /mnt/gentoo /mnt/gentoo/proc /mnt/gentoo/sys /mnt/gentoo/dev /mnt/gentoo/home Works even if $dir contains dangerous characters (e.g. comes from a commandline argument). Show Sample Output
This is sample output - yours may be different.
```
$ egrep_escape '../lost+found'
\.\./lost\+found

$ egrep_escape "^(\W+|[a-z]{2}.*)$"
\^$\\W\+\|\[a-z][{]2}\.\*$\$
```
0

egrep_escape() { echo "$1" |sed -re 's/([\\.*+?(|)^$[])/\\\1/g' -e 's/\{/[{]/g'; }

regnarg · 2012-08-02 16:54:43 3
Opens up cached flash plugin video files(linux)
This is sample output - yours may be different.
0

vlc $(for f in /proc/$(pgrep -f libflashplayer.so |head -n 1)/fd/*; do ;if $(file ${f} |grep -q "broken symbolic link to \`/tmp/FlashXX"); then echo ${f};fi;done)

rtaycher · 2012-08-07 08:04:56 3
Alarmclock function makes usage of a BEL (\a) character.

usage: alarmclock TIME TIME is a sleep(1) parameter which tells function how long to wait until raise the alarm.
This is sample output - yours may be different.
0

alarmclock() { [ $1 ] || echo Parameter TIME is missing. 1>&2 && return 1 ; ( sleep $1 ; for x in 9 8 7 6 5 4 3 2 1 ; do for y in `seq 0 $[ 10 - $x ] ` ; do printf "\a"; sleep 0.$x ; done ; done ) & }

lkj · 2012-08-16 15:35:15 3
Output centralized text on command line

Echoes text horizontally centralized based on screen width
This is sample output - yours may be different.
0

centralized(){ L=`echo -n $*|wc -c`; echo -e "\x1b[$[ ($COLUMNS / 2) - ($L / 2) ]C$*"; }

xenomuta · 2012-08-16 18:19:26 6

Look for free ip's in a given /24 subnet.

The command will make it easy to determine free IP ranges in a crowded sub-net. Show Sample Output

SUBNET="192.168.41" ; diff -y <(nmap -sP -n ${SUBNET}.0/24 | grep ${SUBNET}. | awk '{print $5}' | sort -t"." -k4 -n) <(for i in $(seq 1 254); do echo ${SUBNET}.$i; done)

michel_p · 2012-08-28 09:11:18 4

Capture screen and mic input using FFmpeg and ALSA

Now we can capture only a specific window (we have to chose by clicking on it) ffmpeg complains about "Frame size must be a multiple of 2" so we calculate the upper even number with (g)awk trickery. We remove the grep, we are already using (g)awk here ....why losing time with grep !!! ;) Show Sample Output
This is sample output - yours may be different.
```
...
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
frame=   18 fps= 11 q=0.0 Lsize=      55kB time=1.80 bitrate= 252.5kbits/s    
video:55kB audio:0kB global headers:0kB muxing overhead 1.626234%
```
0

a=$(xwininfo |gawk 'BEGIN {FS="[x+ \t]*"} /-geometry/ {print int(($3+1)/2)*2"x"int(($4+1)/2)*2"+"$5"+"$6}') ; echo ${a} ; ffmpeg -f x11grab -s ${a} -r 10 -i :0.0 -sameq -f mp4 -s wvga -y /tmp/out.mpg

dwygo · 2012-08-31 14:48:41 5
Burn a simple DVD-Video without menu using any given video file

This is the fastest way to burn a DVD-Video from the command line. Dependencies: libav-tools dvdauthor growisofs The first command: avconv -i input.avi -target pal-dvd dvd.mpg converts any given video file avconv can handle into MPEG2-PS (6 Mbit/s) with AC3 audio (448 kbit/s). If your distribution is not up to date, just use ffmpeg - the syntax is the same. Hint: If you want to create an NTSC DVD, type ntsc-dvd instead ;-) The second command: echo PAL > ~/.config/video_format sets PAL as your default video format. This is a workaround for an old dvdauthor bug. If you want NTSC, guess what? Type NTSC instead! The third command: dvdauthor -o dvd/ -t dvd.mpg creates .VOB files and adds them to the dvd/ folder. You don't have to create this folder yourself. You can add as many titles as you like, just keep in mind that there's a maximum of 4482 MiB (4.37 GiB) for normal DVDs. The fourth command: dvdauthor -o dvd/ -T finishes the DVD-Video. Now you can burn your DVD using growisofs: growisofs -Z /dev/dvd -dvd-video dvd/ Sources: manpages http://tuxicity.wordpress.com/2006/12/01/avi-to-dvd-with-ffmpeg-and-dvdauthor/
This is sample output - yours may be different.
0

avconv -i input.avi -target pal-dvd dvd.mpg && echo PAL > ~/.config/video_format && dvdauthor -o dvd/ -t dvd.mpg && dvdauthor -o dvd/ -T && growisofs -Z /dev/dvd -dvd-video dvd/

ppq · 2012-09-09 20:56:54 4
test console colors
This is sample output - yours may be different.
0

( 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; )

mkfmn · 2012-09-18 11:23:46 14
Display CPU usage in percentage

Using the output of 'ps' to determine CPU usage is misleading, as the CPU column in 'ps' shows CPU usage per process over the entire lifetime of the process. In order to get *current* CPU usage (without scraping a top screen) you need to pull some numbers from /proc/stat. Here, we take two readings, once second apart, determine how much IDLE time was spent across all CPUs, divide by the number of CPUs, and then subtract from 100 to get non-idle time. Show Sample Output
This is sample output - yours may be different.
```
1.84% CPU Usage
```
0

NUMCPUS=`grep ^proc /proc/cpuinfo | wc -l`; FIRST=`cat /proc/stat | awk '/^cpu / {print $5}'`; sleep 1; SECOND=`cat /proc/stat | awk '/^cpu / {print $5}'`; USED=`echo 2 k 100 $SECOND $FIRST - $NUMCPUS / - p | dc`; echo ${USED}% CPU Usage

toxick · 2012-10-02 03:57:51 6
Add current directory to Ruby load path
This is sample output - yours may be different.
0

echo "$: << '.'" >> $IRBRC

emmasteimann · 2012-10-05 16:26:27 5
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Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Get your commandlinefu points (upvotes - downvotes)

Like command #4845, prints score, number of entries, and average score.

list block devices

Shows all block devices in a tree with descruptions of what they are.

Recurse through directories easily

This is a simple case of recursing through all directories, adding the '.bak' extension to every file. Of course, the 'cp $file $file.bak' could be any code you need to apply to your recursion, including tests, other functions, creating variables, doing math, etc. Simple and clean recursion.

Crop video starting at 00:05:00 with duration of 20 mins

Get a range of SVN revisions from svn diff and tar gz them

Handy when you need to create a list of files to be updated when subversion is not available on the remote host. You can take this tar file, and upload and extract it where you need it. Replace M and N with the revisions specific to yours. Make sure you do this from an updated (svn up) working directory.

shut of the screen.

Find usb device in realtime

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

Revert all modified files in an SVN repo

Go up multiple levels of directories quickly and easily.

This is a kind of wrapper around the shell builtin cd that allows a person to quickly go up several directories. Instead of typing: cd ../.. A user can type: cd ... Instead of: cd ../../.. Type: cd .... Add another period and it goes up four levels. Adding more periods will take you up more levels.

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Commands using echo (1,545)

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