All commands sorted by votes

All commands (14,187)

sorted by

format txt as table not joining empty columns adding header with column numbers

This version now adds a header with consecutive numbering. Show Sample Output
This is sample output - yours may be different.
```
cat file.csv
column_a;column_b;column_c
a;b;c
;b;c
a;b;

cat file.csv | perl -pe 'if($. == 1) {@h = split(/;/); $i = 1 ; map { $_ = $i; $i++ } @h; print join(" ;", @h) , "\n"} ; s/(^|;);/$1 ;/g' | column -ts\;
1         2         3
column_a  column_b  column_c
a         b         c
          b         c
a         b
```
0

cat file.csv | perl -pe 'if($. == 1) {@h = split(/;/); $i = 1 ; map { $_ = $i; $i++ } @h; print join(" ;", @h) , "\n"} ; s/(^|;);/$1 ;/g' | column -ts\; | less -S

bashrc · 2011-08-31 12:52:02 4
Show external IP; Short and sweet.

lynx -dump ip.nu Your IP address is 0.0.0.0
This is sample output - yours may be different.
0

lynx -dump ip.nu

ariver · 2012-05-02 14:54:12 3
change default Web browser

also use: update-alternatives --config gnome-www-browser
This is sample output - yours may be different.
0

update-alternatives --config x-www-browser

gwd · 2012-07-08 20:27:42 4
Preview All Files in Directory
This is sample output - yours may be different.
0

find . -type f | xargs -I% bash -c 'echo -e "\033[31m%\033[0m" && [[ ! `file %` =~ .*binary.* ]] && head "%"'

mx4492 · 2012-08-28 12:52:38 9
Total size in RPM packages

It is not the installed size in files, but the size of RPM packages. Show Sample Output
This is sample output - yours may be different.
```
Total size in packages = 14.5 GB
```
0

rpm -qa --queryformat '%{SIZE}\n' | awk '{sum += $1} END {printf("Total size in packages = %4.1f GB\n", sum/1024**3)}'

skytux · 2013-12-14 20:22:41 10
List EC2 servers by tag name and instanceId

Uses the python-based AWS CLI (https://aws.amazon.com/cli/) and the JSON query tool, JQ (https://stedolan.github.io/jq/)
This is sample output - yours may be different.
0

aws ec2 describe-instances --query "Reservations[*].Instances[*]" | jq '.[]|.[]|(if .Tags then (.Tags[]|select(.Key == "Name").Value) else empty end)+", " +.InstanceId'

thatinstant · 2014-06-26 20:01:12 7
easiest way to get kernel version without uname

The dmesg will show the kernel it is booting. No more dependency on files Show Sample Output
This is sample output - yours may be different.
```
# dmesg                                  
Booting Linux on physical CPU 0
Initializing cgroup subsys cpu
Linux version 3.4.67-01422-gd3ffcc7-dirty (digit@tyrion.par.corp.google.com) (gcc version 4.8 (GCC) ) #1 PREEMPT Tue Sep 16 19:34:06 CEST 2014
```
0

dmesg

sagarsakre · 2014-10-22 10:03:56 8
What's the weather like?

Just 253 chars of pure UNIX magic, with curl. I created this contrived bash one-liner while building a command-line bash game : www.rubegoldbash.com. Show Sample Output
This is sample output - yours may be different.
```
   Endeavour Inlet

   title
   19.128?
   Clouds: 88%
   Humidity: 98%
   Wind: 13.12 m/s
   Pressure: 1013.76hpa
```
0

curl -s ip.appspot.com | xargs -n 1 curl -s "freegeoip.net/csv/$1" | cut -d ',' -f '9 10' | sed 's/,/\&lon=/g' | xargs -n 1 echo "http://api.openweathermap.org/data/2.5/weather?mode=html&lat=$1" | sed 's/ //g' | xargs -n 1 curl -s $1 | lynx -stdin -dump

supermoustachu · 2015-02-04 00:47:06 14
Convert video file to animated gif (high quality)

Requires ffmpeg with image2pipe filter and imagemagick Show Sample Output
This is sample output - yours may be different.
```
<gif output>
```
0

ffmpeg -i input.mp4 -vf scale=w=320:h=-1 -r 10 -f image2pipe -vcodec ppm - | convert -delay 5 -loop 0 - output.gif

TheMadScientist · 2016-01-08 17:21:37 11
To help sort through differences in .txt files
This is sample output - yours may be different.
0

diff *txt -u | less

creepyjones · 2016-07-20 17:53:04 12
Salvage a borked terminal
This is sample output - yours may be different.
0

tput rmso

hansgruber · 2017-07-13 20:01:42 17
XZIP many catalogs

Find (by regular expression) and compress (xzip) catalogs then remove source catalogs
This is sample output - yours may be different.
0

find . -type d |awk '$1 ~ /[0-9]/ {print $0}' |xargs -P 4 -I NAME tar --remove-files -vcJf NAME.tar.xz NAME

Glafir · 2017-08-28 08:05:29 19
package most recent files in project

create tar.bz2 package from files "-type f" modificated today "-mtime -1" in ~/project
This is sample output - yours may be different.
0

find ~/project -mtime -1 -type f -print | tar jcvf myfiles.tar.bz2 -T -

voyeg3r · 2009-03-13 13:03:11 4
Disable graphical login on OpenSolaris

On Solaris 10 you used dtconfig -d to achieve this. The command will disable X and your system will now boot to a text console.
This is sample output - yours may be different.
0

svcadm disable gdm

thesuperjason · 2009-07-25 02:32:46 3
Convert a .wav file to .sln file
This is sample output - yours may be different.
0

sox is_that_correct.wav -t raw -r 8000 -s -w -c 1 is_that_correct.sln

tkembo · 2011-08-31 13:03:30 4
Colored word-by-word diff of two files

Requires wdiff. Prints the word-by-word diff with the old version highlighted in red, and the new in green. Change the colors by altering 41m and 42m. 45m is more of a magenta and may be easier to read.
This is sample output - yours may be different.
0

wdiff -n -w $'\033[30;41m' -x $'\033[0m' -y $'\033[30;42m' -z $'\033[0m' oldversion.txt newversion.txt

abracadabra · 2011-11-10 18:35:41 3
Symlink most recent file to 'latest' using full paths.
This is sample output - yours may be different.
0

ln -s "`find /path -type f -iname $(ls -t /path | head -1 )`" /path/latest

logikal · 2011-12-21 07:20:17 3
Print trending topics on Twitter

Prints top 5 twitter topics. Not very well written at all but none of the others worked.
This is sample output - yours may be different.
0

curl -s mobile.twitter.com/search | sed -n '/trend_footer_list/,/\ul>/p' | awk -F\> '{print $3}' | awk -F\< '{print $1}' | sed '/^$/d'

articmonkey · 2012-03-15 17:17:06 3
Geographic location and more for current external IP address.
This is sample output - yours may be different.
0

lynx -dump http://www.ip2location.com/ | sed -n '/^ *Field Name *Value *$/,/^ *\[_\] *Mobile .*Carrier.*name/p'

ariver · 2012-05-02 15:46:59 5
find css or js files, minifiy with in-path-yuicompressor, gzip output, and save into <static-file>.gz
This is sample output - yours may be different.
0

find -regextype posix-egrep -regex '.*\.(css|js)$' | xargs -I{} sh -c "echo '{}' && yuicompressor '{}' | gzip -c > '{}.gz'"

frankowp · 2013-12-14 20:27:47 8
Search recursively to find a word or phrase in certain file types, such as C code

Warnings and errors will be suppressed Show Sample Output
This is sample output - yours may be different.
```
./web/blah.html:33:		<div>some string and some such</div>
```
0

grep --include=\*.html -R "some string" . 2>/dev/null

sjmixon · 2015-02-04 17:59:41 8
grant me all the groups

NSFW - use this on personal laptops where you want your personal user to have all the groups Show Sample Output
This is sample output - yours may be different.
```
Adding user user1 to group lpadmin
.....all the groups
```
0

cut -f1 -d: /etc/group|xargs -n1 -I{} gpasswd -a $USERNAME {}

thoth · 2016-01-08 18:03:36 12
debian keyboard layout reconfigure

select generic 105 intl. pc > german (turkisch)
This is sample output - yours may be different.
0

dpkg-reconfigure keyboard-configuration

aysadk · 2017-07-14 15:04:02 100
rsnapshot vim edit replaying space tabs
This is sample output - yours may be different.
0

sed 's/ \+ /\t/g' /usr/local/etc/rsnapshot.conf >/tmp/snap.conf

aysadk · 2017-08-28 13:18:12 18
Disable all iptables rules without disconnecting yourself

This turns your iptables packet filter to a "Allow any from any to any" filter, so you can rule out any filtering issues when you have a problem to enable a connection from or to your host. To re-enable it, run /etc/init.d/iptables restart
This is sample output - yours may be different.
0

iptables -F && iptables -X && iptables -P INPUT ACCEPT && iptables -OUTPUT ACCEPT

lme · 2009-03-27 15:03:54 5
‹ First < 425 426 427 428 429 > Last ›

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

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Undo commit in Mercurial

Edit a script that's somewhere in your path.

Often I need to edit a bash or perl script I've written. I know it's in my path but I don't feel like typing the whole path (or I don't remember the path).

exit if another instance is running

runs only one instance.

List the size (in human readable form) of all sub folders from the current location

old man's advice

Add an audio soundtrack to a series of images to create an flv

Creates a 5 minute flv file, with the given sequence of images and audio with 0.5 fps. The images were created using the following command: for x in `seq 0 300`; do cp ../head.PNG head-`printf '%03d' $x`.png; done You can also inject metadata to seek easier using yamdi as follows: yamdi -i muxed.flv -o video.flv

Print lines in a text file with numbers in first column higher or equal than a value

A text file contains thousands of numbers. This command prints lines were the number is greater or equal than a specified value (134000000).

Quickly analyze apache logs for top 25 most common IP addresses.

This command is much quicker than the alternative of "sort | uniq -c | sort -n".

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

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)

All commands (14,187) 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…

All commands (14,187)

sorted by