Commands tagged bash sorted by votes

Commands tagged bash (821)

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Show bash's function definitions you defined in .bash_profile or .bashrc

If you omit the function name, the command will display all definitions Show Sample Output
This is sample output - yours may be different.
```
$ declare -f cd
cd () 
{ 
    builtin cd "${@:-$HOME}" && ls -F -G -H -hol
}
```
5

declare -f [ function_name ]

haivu · 2009-10-22 17:52:47 6
set your ssd disk as a non-rotating medium

if you still get a permissions error using sudo, then nano the file: sudo nano -w /sys/block/sdb/queue/rotational and change 1 to 0 this thread: http://www.ocztechnologyforum.com/forum/showpost.php?p=369836&postcount=15 says that this will "help the block layer to optimize a few decisions"
This is sample output - yours may be different.
5

sudo echo 0 > /sys/block/sdb/queue/rotational

nickleus · 2009-11-27 12:16:17 10
Find the location of the currently loaded php.ini file

Quick and easy way to find out which php.ini file is being used. Especially useful if you just need to find the location of the file for editing purposes. Show Sample Output
This is sample output - yours may be different.
```
[user@server ~]$ php -i |grep php.ini
Configuration File (php.ini) Path => /usr/local/lib
Loaded Configuration File => /usr/local/lib/php.ini
```
5

php -i | grep php.ini

jemmille · 2009-12-23 15:52:20 4
download file1 file2 file3 file4 .... file 100
This is sample output - yours may be different.
5

wget http://domain.com/file{1..100}

wincus · 2010-01-12 14:28:04 3
List bash functions defined in .bash_profile or .bashrc
This is sample output - yours may be different.
5

declare -F | cut -d ' ' -f 3

wilmoore · 2010-05-29 08:19:47 4
convert all flac files in a folder to mp3 files with a bitrate of 192 kbps
This is sample output - yours may be different.
5

for f in *;do flac -cd $f |lame -b 192 - $f.mp3;done

nickleus · 2010-10-19 07:55:11 3
Have your sound card call out elapsed time.

Useful contexts : You are doing yoga or some other physical training in which you are holding a position. Or you practice the pomodoro productivity technique. Or your girlfriend said "We're leaving in 40 minutes". Design details: sleep executes before espeak to give you a 5 seconds head start. espeak is run in the background so it doesn't mess up the timing.
This is sample output - yours may be different.
5

for ((x=0;;x+=5)); do sleep 5; espeak $x & done

adeverteuil · 2012-02-22 00:26:57 3
Remove all leading and trailing spaces or tabs from all lines of a text file

Bash only, no sed, no awk. Multiple spaces/tabs if exists INSIDE the line will be preserved. Empty lines stay intact, except they will be cleaned from spaces and tabs if any available.
This is sample output - yours may be different.
5

while read l; do echo -e "$l"; done <1.txt >2.txt

knoppix5 · 2012-03-13 14:27:49 6
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 34
Make changes in .bashrc immediately available

Any changes to BASH shell made in .bashrc will be active in the current terminal window from the moment you execute this command, ie. aliases, prompt settings etc. No need to restart terminal. (In BASH 'source' simile to 'eval' lets you generally execute any bunch of commands stacked in a text file).
This is sample output - yours may be different.
5

source ~/.bashrc

knoppix5 · 2012-10-01 08:30:19 4
Alias for lazy tmux create/reattach
This is sample output - yours may be different.
5

tmux attach || tmux new

dirkr · 2012-12-03 07:06:05 8
Graphically show percent of mount space used

Automatically drops mount points that have non-numeric sizes (e.g. /proc). Tested in bash on Linux and AIX. Show Sample Output
This is sample output - yours may be different.
```
/                        ============= 13
/var                     ================== 18
/home                    ============================================ 44
/tmp                     == 2
/boot                    ====== 6
/dev/shm                  0
```
5

for m in `df -P | awk -F ' ' '{print $NF}' | sed -e "1d"`;do n=`df -P | grep "$m$" | awk -F ' ' '{print $5}' | cut -d% -f1`;i=0;if [[ $n =~ ^-?[0-9]+$ ]];then printf '%-25s' $m;while [ $i -lt $n ];do echo -n '=';let "i=$i+1";done;echo " $n";fi;done

drockney · 2013-07-29 20:12:39 6
Command to rename multiple file in one go
This is sample output - yours may be different.
5

rename 's/.xls/.ods/g' *.xls

jedifu · 2013-09-12 13:42:56 8
Get a list of all TODO/FIXME tasks left to be done in your project

Place this in your .bashrc (or run it once) to set the `tasks` alias. Next time you enter `tasks` into a terminal, it will give you a list of all TODO and FIXME comments in the current directory and child directories, giving you a quick overview of what you still have to do!
This is sample output - yours may be different.
5

alias tasks='grep --exclude-dir=.git -rEI "TODO|FIXME" . 2>/dev/null'

joepie91 · 2013-10-17 16:40:10 28
Simple colourized JSON formatting for BASH

Leave out pygmentize or `pip install pygments` first. Show Sample Output
This is sample output - yours may be different.
```
$ curl -s http://api.openweathermap.org/data/2.5/weather?q=Amsterdam,nl | pp

# this output is colourized
{
    "base": "cmc stations",
    "clouds": {
        "all": 20
    },
    "cod": 200,
    "coord": {
        "lat": 52.37,
        "lon": 4.89
    }
    /* ... */
}
```
5

alias pp='python -mjson.tool|pygmentize -l js'

wires · 2014-05-22 10:29:44 11
Randomly run command

Randomly decide whether to run a command, or fail. It's useful for testing purposes. . Usage: ran PERCENTAGE COMMAND [ARGS] Note: In this version the percentage is required. . This is like @sesom42 and @snipertyler's commands but in a USABLE form. . e.g. In your complicated shell script, put "ran 99" before a crucial component. Now, it will fail 1% of the time allowing you to test the failure code-path. ran 99 my_complex_program arg1 arg2 Show Sample Output
This is sample output - yours may be different.
```
$ ran 50 echo hello; echo $?
hello
0
$ ran 50 echo hello; echo $?
1
```
5

ran() { [ $((RANDOM%100)) -lt "$1" ] && shift && "$@"; }

flatcap · 2015-07-16 13:32:45 27
ShellCheck all the bash/sh script under a specific directory excluding version control

This is a commodity one-liner that uses ShellCheck to assure some quality on bash and sh scripts under a specific directory. It ignores the files in .git directory. Just substitute "./.git/*" with "./.svn/*" for older and booring centralized version control. Just substitute ShellCheck with "rm" if your scripts are crap and you want to get rid of them :)
This is sample output - yours may be different.
5

find . -type f ! -path "./.git/*" -exec sh -c "head -n 1 {} | egrep -a 'bin/bash|bin/sh' >/dev/null" \; -print -exec shellcheck {} \;

brx75x · 2017-03-16 08:43:56 24

Calculate days on which Friday the 13th occurs

I removed the dependency of the English language Show Sample Output

for y in $(seq 1996 2018); do echo -n "$y -> "; for m in $(seq 1 12); do NDATE=$(date --date "$y-$m-13" +%w); if [ $NDATE -eq 5 ]; then PRINTME=$(date --date "$y-$m-13" +%B);echo -n "$PRINTME "; fi; done; echo; done

ginochen · 2018-06-25 09:20:57 252

shell bash iterate number range with for loop

Bash's arithmetic evaluation.
This is sample output - yours may be different.
5

for((i=1;i<=10;i++)){ echo $i; }

metropolis · 2019-07-28 02:32:09 77
Check if a domain is available for purchase

A quick alias to check if a domain is already registered or if it's available for purchase. Show Sample Output
This is sample output - yours may be different.
```
$ canibuy commandlinefu.com
taken
$ canibuy commandlinekungfu.com
available
```
5

function canibuy { whois "$1" 2>/dev/null | grep -q 'Registrant' && echo "taken" || echo "available" }

tyzbit · 2023-06-21 15:01:25 181
Create md5sum of files under the current dir excluding some directories

Useful if you want get all the md5sum of files but you want exclude some directories. If your list of files is short you can make in one command as follow: find . -type d $ -name DIR1 -o -name DIR2 $ -prune -o -type f -exec md5sum {} \; Alternatively you can specify a different command to be executed on the resulting files.
This is sample output - yours may be different.
4

find . -type d $ -name DIR1 -o -name DIR2 $ -prune -o -type f -print0 | xargs -r0 md5sum

starchox · 2009-03-05 21:26:24 4
automount samba shares as devices in /mnt/

the middle command between the ; and ; is the vi commands that insert that line into the last line of the file, the esc with the carets is literally hitting the escape key, you have to have the smbfs package installed to do it, I use it to access my iTunes music on my mac from my linux PC's with amarok so I can play the music anywhere in the house. among other things, it allows you to access the files on that share from your computer anytime you're on that network.
This is sample output - yours may be different.
4

sudo vi /etc/fstab; Go//smb-share/gino /mnt/place smbfs defaults,username=gino,password=pass 0 0<esc>:wq; mount //smb-share/gino

GinoMan2440 · 2009-04-02 16:04:35 9
list and sort files by size in reverse order (file size in human readable output)

This command list and sort files by size and in reverse order, the reverse order is very helpful when you have a very long list and wish to have the biggest files at the bottom so you don't have scrool up. The file size info is in human readable output, so ex. 1K..234M...3G Tested with Linux (Red Hat Enterprise Edition)
This is sample output - yours may be different.
4

ls -S -lhr

rez0r · 2009-04-28 01:28:57 5
Count to 65535 in binary (for no apparent reason)

Yes, it's useless.
This is sample output - yours may be different.
4

a=`printf "%*s" 16`;b=${a//?/{0..1\}}; echo `eval "echo $b"`

rhythmx · 2009-06-13 06:32:35 5
Display screen window number in prompt

Add this to your $HOME/.bashrc file. It will only set this prompt if it is running inside screen ($WINDOW var is set) Looks like this... ion@atomos:~[2]$ Show Sample Output
This is sample output - yours may be different.
```
ion@atomos:~[2]$
```
4

[[ "$WINDOW" ]] && PS1="\u@\h:\w[$WINDOW]\$ "

recursiverse · 2009-07-23 06:46:19 7
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Sort dotted quads

Sort a list of IPV4 addresses in numerical order. Great as a filter, or within vim using !}

check open ports without netstat or lsof

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" }

geoip information

That makes a function you can put in your ~/.bashrc to run it when you need in any term with an IP as argument

DVD to YouTube ready watermarked MPEG-4 AVI file using mencoder (step 2)

Reencodes to MPEG-4 DivX output video file from step 1. Audio stream is simply copied. Resizes to 320x240 and deinterlaces as needed. A heading subtitle file is applied as watermark. This heading subtitle file can be a URL.

copy from host1 to host2, through your host

Good if only you have access to host1 and host2, but they have no access to your host (so ncat won't work) and they have no direct access to each other.

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 your ssd disk as a non-rotating medium

if you still get a permissions error using sudo, then nano the file: sudo nano -w /sys/block/sdb/queue/rotational and change 1 to 0 this thread: http://www.ocztechnologyforum.com/forum/showpost.php?p=369836&postcount=15 says that this will "help the block layer to optimize a few decisions"

Convert any sequence of spaces/tabs to single space/tab

Remove empty lines additionally: $ tr -s ' \t\n' 2.txt identical with: $ tr -s '[:space:]' 2.txt To "clean perfectly" a text or code file, You can combine this command with another one: $ while read l; do echo -e "$l"; done 2.txt (= remove all leading and trailing spaces or tabs from all lines of a text file)

Creates a symbolic link or overwrites an existing one

-n: dereference the existing link -v: (optional) to be sure of what is being done -f: force the deletion of the existing one -s: creates a symlink Be careful: the destination can also be a file or a directory and it will be overwritten.

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Commands tagged bash (821)

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