Commands tagged bash sorted by votes

Commands tagged bash (822)

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Purge frozen messages in Exim

Although Exim will purge frozen (undeliverable) messages over time, the command "exim -Mrm #id#" where #id# is a particular message ID will purge a message immediately. Being lazy, I don't want to type the command for each frozen message, so I wrote the one-liner to do it for me.
This is sample output - yours may be different.
-2

for i in `mailq | awk '$6 ~ /^frozen$/ {print $3}'`; do exim -Mrm $i; done

rjamestaylor · 2010-01-13 21:28:45 4
Purge frozen messages in Exim
This is sample output - yours may be different.
-2

exipick -zi | xargs exim -Mrm

markszabo · 2010-01-13 21:53:43 4

Blinking, Color Highlighted search for input/output and files, like grep --color

hb(){ sed "s/$$*$/`tput setaf 2;tput setab 0;tput blink`\1`tput sgr0`/gI"; } hb blinks, hc does a reverse color with background.. both very nice. hc(){ sed "s/$$*$/`tput setaf 0;tput setab 6`\1`tput sgr0`/gI"; } Run this: command ps -Hacl -F S -A f | hc ".*$PPID.*" | hb ".*$$.*" Your welcome ;) From my bash profile - http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Show Sample Output

-2

hb(){ sed "s/$$*$/`tput setaf 2;tput setab 0;tput blink`\1`tput sgr0`/gI"; }

AskApache · 2010-04-07 08:45:26 5

Update many subversion projects which reside in one directory

If you have a directory with many working copies of various subversion projects and you want to update them all at once, this one may be for you. Show Sample Output
This is sample output - yours may be different.
```
Authentication realm: <https://foo.com:443> foo-project
Password for 'foodoo': 
At revision 221.
```
-2

for d in $(find . -maxdepth 1 -type d -name '[^.]*'); do cd "$d"; svn up; cd ..; done

udog · 2010-05-28 10:09:19 5
Generate background office noise using Digg feeds and OSX.

Instead of having someone else read you the Digg headlines, Have OSX do it. Requires Curl+Sed+Say. This could probably be easily modified to use espeak for Linux.
This is sample output - yours may be different.
-2

IFS=`echo -en "\n\b"`; for i in $(curl http://feeds.digg.com/digg/container/technology/popular.rss | grep '<title>' | sed -e 's#<[^>]*>##g' | tail -n10); do echo $i; echo $i | sed 's/^/Did you hear about /g' | say; sleep 30; done

echosedawk · 2010-06-07 22:16:19 5
Remove executable bit from all files in the current directory recursively, excluding other directories, firm permissions
This is sample output - yours may be different.
-2

find . -type f -exec chmod 640 {} ';'

lionping · 2010-07-18 21:03:38 5
Show all cowsay's available cowfiles
This is sample output - yours may be different.
-2

cowsay -l | sed '1d;s/ /\n/g' | while read f; do cowsay -f $f $f;done

fizz · 2010-09-06 03:40:42 5
Selecting a random file/folder of a folder

Choose random file from current folder. Avoids using ls.
This is sample output - yours may be different.
-2

for i in *; do echo "$i"; done | shuf -n1

johnraff · 2011-03-17 17:48:42 7
BASH: Print shell variable into AWK

BASH: Print shell variable into AWK
This is sample output - yours may be different.
-2

VAR="foo" ; awk '{ print '"$VAR"' }'

FRUiT · 2011-04-15 07:56:20 4
Colour part of your prompt red to indicate an error
This is sample output - yours may be different.
-2

export PS1='[\[\e[36;1m\]\u@\[\e[32;1m\]\h \[\e[31;1m\]\w]# \[\e[0m\]'

bakhru · 2011-04-16 00:58:51 6
Echo PID of the current running command

Actually $! is an internal variable containing PID of the last job in background. More info: http://tldp.org/LDP/abs/html/internalvariables.html#PIDVARREF Using $! for job control: possibly_hanging_job & { sleep ${TIMEOUT}; eval 'kill -9 $!' &> /dev/null; }
This is sample output - yours may be different.
-2

command & echo $!

Mahrud · 2011-06-08 18:16:38 4
add title and alt-text to your collection of xkcd comics

full command: for fn in xkcd*.png xkcd*.jpg; do; echo $fn; read xw xh <<<$(identify -format '%w %h' $fn); nn="$(echo $fn | sed 's/xkcd-$[0-9]\+$-.*/\1/')"; wget -q -O xkcd-${nn}.json http://xkcd.com/$nn/info.0.json; tt="$(sed 's/.*"title": "$[^"]*$", .*/\1/' xkcd-${nn}.json)"; at="$(sed 's/.*alt": "$.*$", .*/\1/' xkcd-${nn}.json)"; convert -background white -fill black -font /usr/share/fonts/truetype/freefont/FreeSansBold.ttf -pointsize 26 -size ${xw}x -gravity Center caption:"$tt" tt.png; convert -background '#FFF9BD' -border 1x1 -bordercolor black -fill black -font /usr/share/fonts/truetype/freefont/FreeSans.ttf -pointsize 16 -size $(($xw - 2))x -gravity Center caption:"$at" at.png; th=$(identify -format '%h' tt.png); ah=$(identify -format '%h' at.png); convert -size ${xw}x$(($xh+$th+$ah+5)) "xc:white" tt.png -geometry +0+0 -composite $fn -geometry +0+$th -composite at.png -geometry +0+$(($th+$xh+5)) -composite ${fn%\.*}_cmp.png; echo -e "$fn $nn $xw $xh $th $ah \n$tt \n$at\n"; done this assumes that all comics are saved as xkcd-[number]-[title].{png|jpg}. it will then download the title and alt-text, create pictures from them, and put everything together in a new png-file. it's not perfect, but it worked for nearly all my comics. it uses the xkcd-json-interface. though it's poorly written, it doesn't completely break on http://xkcd.com/859/
This is sample output - yours may be different.
-2

for fn in xkcd*.png xkcd*.jpg; do echo $fn; read xw xh <<<$(identify -format '%w %h' $fn); nn="$(echo $fn | sed 's/xkcd-$[^-]\+$-.*/\1/')"; wget -q -O xkcd-${nn}.json http://xkcd.com/$nn/info.0.json; tt="$(sed 's/.*"title": "$[^"]\+$",.*/\1/' ...

fpunktk · 2012-01-06 20:26:11 9
Convert all the symbolic links in $PWD to copies of the referenced files
This is sample output - yours may be different.
-2

for FILE in `ls -1`; do if [ -L "$FILE" ]; then cp $(readlink "$FILE") ${FILE}_rf; rm -f $FILE; mv ${FILE}_rf "$FILE"; fi; done

unixmonkey1907 · 2012-01-16 16:39:41 7
creates or attachs to screen

Tries to reattach to screen, if it's not available, creates one. created an alias "irc" for it, since sometimes i forget if there already is a screen session running with irssi, this way I avoid creating a new one by mistake.
This is sample output - yours may be different.
-2

screen -r irc || screen -S irc irssi

daneoshiga · 2012-10-19 12:12:54 6
Bash function do emulate send to trash files

# put into .bashrc function trash() { if [ -z "$*" ] ; then echo "Usage: trash filename" else local TRASH="${HOME}/.local/share/Trash" if [ ! -d "$TRASH/files" ]; then mkdir -p "$TRASH/files"; fi if [ ! -d "$TRASH/info" ]; then mkdir -p "$TRASH/info"; fi local IFS_BKP=$IFS IFS=' ' for FILE in $@ ; do local BASE=$( basename "$FILE" ) local TRASH_NAME="$BASE" local COUNTER=1 while [ -e "$TRASH/files/$TRASH_NAME" ]; do COUNTER=`expr $COUNTER + 1` TRASH_NAME="$BASE.$COUNTER" done local FULL_PATH=$( readlink -f "$FILE" ) local DATE=$( date +%Y-%m-%dT%H:%M:%S ) mv "$FULL_PATH" "$TRASH/files/$TRASH_NAME" if [ $? -eq 0 ]; then echo "[Trash Info] Path=$FULL_PATH DeletionDate=$DATE" > "$TRASH/info/$TRASH_NAME.trashinfo" fi done IFS=$IFS_BKP fi }
This is sample output - yours may be different.
-2

trash <file>

bkmeneguello · 2012-11-22 18:05:11 5
Find out if a module is installed in perl

This version uses a bash function and does not print the path to the module. Show Sample Output
This is sample output - yours may be different.
```
$ module_exists diagnostics && echo yes || echo no
yes

$ module_exists beeblebrox && echo yes || echo no
no
```
-2

module_exists(){ perl -e 'use '$1 2>/dev/null; }

putnamhill · 2013-01-11 14:47:07 5
How to execute and encrypted and password-protected bash script?

echo "ls" > script.bash; This is my script, a simple 'ls'. gpg -c script.bash; Here I encrypt and passord-protect my script. This creates file script.bash.gpg. cat script.bash.gpg | gpg -d --no-mdc-warning | bash Here I open file script.bash.gpg, decrypt it and execute it.
This is sample output - yours may be different.
-2

echo "ls" > script.bash; gpg -c script.bash; cat script.bash.gpg | gpg -d --no-mdc-warning | bash

betsubetsu · 2013-03-10 09:34:12 14
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 10
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 8
Move files older than 30 days in current folder to

Use find's built-in "exec" option to avoid having to do any weirdness with quoting.
This is sample output - yours may be different.
-2

find . -mtime +30 -exec mv {} old/ \;

minnmass · 2014-02-09 23:05:41 10
Generrate Cryptographically Secure RANDOM PASSWORD

Change :alnum: to :graph: for all printable characters Show Sample Output
This is sample output - yours may be different.
```
FH170AB1DXb4dHlX
```
-2

cat /dev/urandom |tr -c -d '[:alnum:]'|head -c 16;echo

AndrewM · 2019-06-17 17:51:04 38
Alias to list all functions loaded into bash (that don't start with _). Also shows file it's defined in.

Should run anywhere that Bash works.. Your mileage may vary. Show Sample Output
This is sample output - yours may be different.
```
cclock                       206  /home/myuser/.functions.sh
chmodd                       236  /home/myuser/.functions.sh
chmodf                       242  /home/myuser/.functions.sh
cmdfu                        41   /home/myuser/.functions.sh
command_not_found_handle     58   /etc/bash.bashrc
dequote                      148  /usr/share/bash-completion/bash_completion
dmesg_with_human_timestamps  252  /home/myuser/.functions.sh
```
-2

alias functions='shopt -s extdebug;declare -F | grep -v "declare -f _" | declare -F $(awk "{print $3}") | column -t;shopt -u extdebug'

goeltzec · 2021-11-22 06:49:36 612
A bash prompt which shows the bash-version

The colors are defined as variables. e.g. RED="\[\033[01;31m\]" BLUE="\[\033[01;34m\]" Show Sample Output
This is sample output - yours may be different.
```
[p17@debian-bash 3.2:~] $
```
-3

PS1="$BLUE[$CYAN\u$BLUE@$CYAN\h$WHITE-bash \v:$GREEN\w$BLUE]$WHITE \$ "

P17 · 2009-05-06 08:01:06 6
urlencode

curl doesn't provide url-encoding for 'GET' data, it have an option '--data-urlencode', but its only for 'POST' data. Thats why I need to write down this commandline. With 'perl', 'php' and 'python', this is one liner, but just I wrote it for fun. Works in Ubuntu, will work in all linux varients(I hope it will work in unix varients also). Show Sample Output
This is sample output - yours may be different.
```
$ sed -e's/./&\n/g' -e's/ /%20/g' | grep -v '^$' | while read CHAR; do test "${CHAR}" = "%20" && echo "${CHAR}" || echo "${CHAR}" | grep -E '[-[:alnum:]!*.'"'"'()]|\[|\]' || echo -n "${CHAR}" | od -t x1 | tr ' ' '\n' | grep '^[[:alnum:]]\{2\}$' | tr '[a-z]' '[A-Z]' | sed -e's/^/%/g'; done | sed -e's/%20/+/g' | tr -d '\n'; echo
http://www.google.com
http%3A%2F%2Fwww.google.com
$
```
-3

(Command too long..See sample Output..)

mohan43u · 2009-06-14 20:34:37 140
Print a row of 50 hyphens

In bash, by pressing ALT+n and then a character x, x will be printed n times I know is not the same as the original command, but is correlated. Show Sample Output
This is sample output - yours may be different.
```
$ --------------------------------------------------
```
-3

<alt+50>-

kobayashison · 2010-01-07 15:32:47 6
‹ First < 29 30 31 32 33 >

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Coping files, excluding certain files

Preserve file structure when coping and exclude some file o dir patterns

Limit the transfer rate and size of data over a pipe

This example will close the pipe after transferring 100MB at a speed of 3MB per second.

use vi key bindings at the command line

Show the PATH, one directory per line (part 2)

Here is another way to show the path, one directory per line. The command `tr` translates the colon into the new line, taking input from the $PATH variable

convert ascii string to hex

You can use "decode()" in a similar manner: $ python -c 'print "68656c6c6f".decode("hex")'

Stop Flash from tracking everything you do.

Brute force way to block all LSO cookies on a Linux system with the non-free Flash browser plugin. Works just fine for my needs. Enjoy.

Convert multiple flac files to mp3

make sure that flac and lame are installed sudo apt-get install lame flac

ignore .DS_Store forever in GIT

With a couple of little commands, you?ll be able to ignore the .DS_Store files forever from your git repositories on mac! The following command will add the .gitignore file to the git configuration git config --global core.excludesfile ~/.gitignore then, the following, will add the .DS_Store to the list echo .DS_Store >> ~/.gitignore

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Recursive search inside the content of files under current directory - then view the result paginated with 'less'

This command will traverse all of the folders and subfolders under current working directory. For every file inside it, it will do a search inside the content of the file for a specific term 'what'. Then it will print a list of the lines that contain that term (and match that pattern). Each matching line will be preceded with the path and name to the file and then the line number iside taht file wehre the pattern was found. Then the actual content of the matching lien will be printed. The output will be piped throug less, so that the user can scroll through it if it goes beyond the limits of the current display window.

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Commands tagged bash (822)

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