Commands tagged bash sorted by votes

Commands tagged bash (821)

sorted by

determine if a shared library is compiled as 32bit or 64bit

file displays a files type the -L flag means follow sym-links (as libraries are often sym-linked to another this behavior is likely preferred) more complex behavior (*two* grep commands!) could be used to determine if the file is or is not a shared library.
This is sample output - yours may be different.
-3

file -L <library> | grep -q '64-bit' && echo 'library is 64 bit' || echo 'library is 32 bit'

infinull · 2010-03-07 06:31:35 3
sorts /dev/random
This is sample output - yours may be different.
-3

find /dev/ -name random -exec bash -c '[ -r $0 -a -w $0 ] && dd if=$0 | sort | dd of=$0' {} \;

winky · 2010-03-19 12:17:21 5
Bash function to see if the day ends in "y"

For those days when you need to know if something is happening because the day ends in "y". Show Sample Output
This is sample output - yours may be different.
```
$ ends_in_y
1
```
-3

function ends_in_y() { if [ `date +%A | sed -e 's/$^.*$$.$$/\2/'` == "y" ]; then echo 1; else echo 0; fi }

allrightname · 2010-04-06 20:14:34 7
Remove executable bit from all files in the current directory recursively, excluding other directories, firm permissions
This is sample output - yours may be different.
-3

find . -type f -exec chmod a-x {} \;

bandie91 · 2010-07-19 09:02:59 4

make ping run a little faster

Show Sample Output

-3

alias ping='ping -n'

wincus · 2011-01-19 23:39:21 3

Selecting a random file/folder of a folder

The same thing using only Bash built-in's. For readability I've kept the variables out, but it could me made extremely more compact (and totally unreadable!) by stuffing everything inside the single echo command.
This is sample output - yours may be different.
-3

IFS=$'\n'; LIST=`ls -1`; let TOT=`echo $LIST | wc -w`-1 ; array=($LIST); echo "Selected ${array[ ($RANDOM % $TOT) ]}"

ntropia · 2011-03-13 21:30:44 3
BASH: Print shell variable into AWK
This is sample output - yours may be different.
-3

MyVAR=84; awk '{ print "'"$MyVAR"'" }'

EBAH · 2011-04-14 15:49:50 3
Overcome Bash's expansion order

no need for seq or eval
This is sample output - yours may be different.
-3

mkdir ${1..10}

linuts · 2011-07-23 19:20:35 6
Renaming files removing some unwanted extension

For those files in current folder that would be shown in `ls *ext`, for some extension ext, move/rename that file removing the .ext suffix from the file name. It uses Bash's parameter substitution, as seen in http://tldp.org/LDP/abs/html/parameter-substitution.html#PCTPATREF (for analog use in prefix, see http://tldp.org/LDP/abs/html/parameter-substitution.html#PSOREX2 )
This is sample output - yours may be different.
-3

for i in *ext; do mv $i ${i%.ext}; done

paulochf · 2011-11-13 03:58:08 8
convert from decimal to hexadecimal
This is sample output - yours may be different.
-3

hex() { echo $1 16op | dc; }

mwgamera · 2011-12-12 17:12:31 3
Move files older than 30 days in current folder to "old" folder

Will move in that case every file in the current folder older than 30 days to the "old" folder Replace "mv $i old/" by any command such as rm / echo to do something different.
This is sample output - yours may be different.
-3

for i in $(find . -mtime +30); do mv $i old/; done

valferon · 2014-02-05 01:24:45 7
Reports size of all folders in the current folder. Useful when burning CD's and DVD's
This is sample output - yours may be different.
-4

export IFS=$'\n';for dir in $( ls -l | grep ^d | cut -c 52-);do du -sh $dir; done

whatshisname · 2009-02-28 20:30:15 5
!$ - The last argument to the previous command

After a command is run in bash, !$ is set to the last (space-delimited) argument of the command. Great for running several commands against the same file in a row.
This is sample output - yours may be different.
-4

svn status app/models/foo.rb; svn commit -m "Changed file" !$

ggoodale · 2009-03-22 23:14:06 5
Press Any Key to Continue

how to finish command or script without any output Show Sample Output
This is sample output - yours may be different.
```
root@ubuserver:~# read enterKey

root@ubuserver:~#
```
-4

read enterKey

bbmarek · 2009-12-29 00:18:32 7
download file1 file2 file3 file4 .... file 100

With counter format [001, 002, ..., 999] , nice with pictures or wallpapers collections.
This is sample output - yours may be different.
-4

for file in $(seq -f '%03.f' 1 $TOTAL ); do echo "($file/$TOTAL)"; curl -f -O http://domain.com/Name_$file.ext; done

nordri · 2010-01-12 15:23:44 6
Combining text files into one file

the last person who posted used the most roundabout way to concatinate files, there's a reason there's a "conCATinate" command... Using this method, you also get to choose the order of the files, below another person just did *.txt > combined.txt which is fine but the order depends on the implementation of "cat" which is probably alphabetical order of filenames. Show Sample Output
This is sample output - yours may be different.
```
$cat stdHeader tableOfContents introduction body conclusion worksCited index  > researchPaper
$pwd; ls;
/home/ginoman/researchPapers/sample/
body                conclusion                index
introduction        researchPaper             stdHeader
tableOfContents     worksCited
$
```
-4

cat file1 ... fileN > combinedFile;

GinoMan2440 · 2010-04-17 01:00:04 4
Download a file securely via a remote SSH server
This is sample output - yours may be different.
-4

scp $user@$server:$path/to/file .

burned · 2010-08-02 16:26:10 4
before writing a new script

Writes out the shebang line (#!/bin/bash) to the script.
This is sample output - yours may be different.
-4

echo '#!'$(which bash) > script.sh

sharfah · 2012-02-06 08:25:27 8
Create a directory and change into it at the same time
This is sample output - yours may be different.
-4

function mkdcd () { mkdir "$1" && cd "$1" }

shinokada · 2013-08-31 12:48:13 26
..(), go up in directory tree, func to long please refer to description

many have aliases like: alias ...="cd ../../" alias ....="cd ../../../" and so furth. ..() mitigates to need for those aliases, see sample output for an example # .. -> go up 1 directory # .. 4 -> go up 4 directories ..() { local DIR='' declare -i NUM=0 if [[ ${1} =~ ^[1-9][0-9]*$ ]] then while (( ${NUM} < ${1:-1} )) do DIR="${DIR}../" NUM=$(( ${NUM} + 1 )) done else DIR=.. fi cd "${DIR}" } Show Sample Output
This is sample output - yours may be different.
```
[ ~/temp/foo/bar/baz ] $ .. 3
[ ~/temp ] $ 
```
-4

[ ~/temp/foo/bar/baz ] $ .. 3

Xk2c · 2015-01-01 20:41:17 10
Kill a background job

Show Sample Output
This is sample output - yours may be different.
```
$ ping www.google.com &
$ jobs
[1]+  Running                 ping www.google.com &
$ kill %1
[1]+  Terminated              ping www.google.com &
$
```
-5

kill %1

prayer · 2009-04-09 11:54:13 4

Remove current directory (REVISED)

Credit goes to "eightmillion" Show Sample Output

-5

removedir(){ read -p "Delete the current directory $PWD ? " human;if [ "$human" = "yes" ]; then [ -z "${PWD##*/}" ] && { echo "$PWD not set" >&2;return 1;}; rm -Rf ../"${PWD##*/}"/ && cd ..; else echo "I'm watching you" | pv -qL 10; fi; }

oshazard · 2010-01-20 08:01:21 9

View the newest xkcd comic.

Add an alias to your .bashrc that allows you to issue the command xkcd to view (with gwenview) the newest xkcd comic... I know there are thousands of them out there but this one is at least replete with installer and also uses a more concise syntax... plus, gwenview shows you the downloading progress as it downloads the comic and gives you a more full featured viewing experience.
This is sample output - yours may be different.
-5

echo alias xkcd="gwenview `w3m -dump http://xkcd.com/|grep png | awk '{print $5}'` 2> /dev/null" >> .bashrc

GinoMan2440 · 2010-01-30 20:38:16 5
Short one line while loop that outputs parameterized content from one file to another
This is sample output - yours may be different.
-5

while read col1 col23; do echo $col1; done < three-column.txt > first-column.txt

infinull · 2010-07-09 03:59:20 4
View the newest xkcd comic.

KISS To get a random xkcd comic: xdg-open http://dynamic.xkcd.com/random/comic/
This is sample output - yours may be different.
-5

xdg-open http://xkcd.com/

unixmonkey8024 · 2010-08-25 19:14:11 3
‹ First < 30 31 32 33 >

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Visit wikileaks.com

Who needs a DNS server

Check if the files in current directory has the RPATH variable defined

Using gentoo prefix portage I got in a situation where some packages did not contain the needed RPATH variable. This command helped me to find out which ones I should recompile

Put a console clock in top right corner

This puts a clock in the top right of the terminal. This version doesn't use tput, but uses escape codes

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" }

Get file access control list

Function that counts recursively number of lines of all files in specified folders

Create multiple mp4 files using avidemux

Convert multiple files using avidemux. Version updated (thanks to the guys who helped me giving me hints about how to improve the command). Works with files whose name contains blank characters. One of the reasons why I love open source: everyone can take something "done" and improve it to make it better! If u have suggestions, please let me know.

Nginx - print all optional modules before compilation

wget http://nginx.org/download/nginx-1.15.3.tar.gz && tar -xzf 1.15.3.tar.gz && cd nginx-1.15.3

Reverse SSH

this command from the source server and this follow in the destination server: ssh user@localhost -p 8888

Prevent an IPv6 address on an interface from being used as source address of packets.

If two or more IPv6 addresses are assigned to an interface, apply this command to all but the address that you want to use as the source address of outbound packets. This is Linux-specific and requires the iproute package, or equivalent for your distribution.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands tagged bash

Commands tagged bash (821) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands tagged bash (821)

sorted by