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intersection between two files

print members both in file1 and file2
This is sample output - yours may be different.
-1

sort file1 file2 | uniq -d

emacs · 2010-05-28 10:25:31 6
Remove a line from a file using sed (useful for updating known SSH server keys when they change)

Easily removes line #2 in ~/.ssh/known_hosts. Show Sample Output
This is sample output - yours may be different.
-1

perl -p -i -e 's/.*\n//g if $.==2' ~/.ssh/known_hosts

meappy · 2012-01-17 14:11:03 3
List OSX applications and versions.

Uses find, plutil and xpath. Note: Some applications don't have proper information. system_profiler might be better to use. It's a bit slow query. Due to command length limit, I removed -name "*.app" and CFBundleName. Show Sample Output
This is sample output - yours may be different.
```
/Applications/CheatSheet.app
v1.0.3
/Applications/Chess.app
v3.0
```
-1

find /Applications -type d -maxdepth 1 -exec sh -c 'echo "{}"; (plutil -convert xml1 -o - "{}/Contents/Info.plist" | xpath /dev/stdin "concat(\"v\", /plist/dict/string[preceding-sibling::key[1]=\"CFBundleShortVersionString\"]/node())" 2>/dev/null)' \;

darkfader · 2013-03-29 14:01:23 4
Compare a remote file with a local file

Or, if you have restricted access for sftp only, I think you can still do this: diff /path/to/localfile <(scp user@host:/path/to/remotefile >(cat))
This is sample output - yours may be different.
-1

diff /path/to/localfile <(ssh user@host cat /path/to/remotefile)

mc0e · 2013-05-24 09:24:31 8
Add cover-art to mp3 tags
This is sample output - yours may be different.
-1

eyeD3 --add-image=coverart.jpg:FRONT_COVER musicfile.mp3

munter · 2013-08-17 22:35:54 8
get size of a file
This is sample output - yours may be different.
-1

du -hs file-name

bharat · 2014-05-09 07:22:53 7
Get a text on a position on the file and store in a variable
This is sample output - yours may be different.
-1

TIMEUNIT=$(awk '/timescale/{print NR}' a)

arcege · 2009-10-28 12:12:37 3
Match a URL

don't have to be that complicated
This is sample output - yours may be different.
-1

cho "(Something like http://foo.com/blah_blah)" | awk '{for(i=1;i<=NF;i++){if($i~/^(http|ftp):\/\//)print $i}}'

unixmonkey7109 · 2009-11-28 03:31:41 6
Recursively remove .svn directories

man find: If no paths are given, the current directory is used. - Can anybody tell me why so many people are typing the dot?
This is sample output - yours may be different.
-1

find -type d -name ".svn" -print0 | xargs -0 rm -rf

tuxilicious · 2010-02-25 10:16:18 6
encode a text to url_encoded format
This is sample output - yours may be different.
-1

groovy -e 'println URLEncoder.encode("Some text")'

yababay · 2010-08-30 16:04:29 4
display mean response time of intermediates to a specified host

mtr is a network utility that combines traceroute and ping utility
This is sample output - yours may be different.
-1

mtr -c 50 -r example.com

ohe · 2015-08-05 07:18:52 10
command to display info about the core specified

Display information about the cores. * sudo apt-get install schedtool Show Sample Output
This is sample output - yours may be different.
```
PID     1: PRIO   0, POLICY N: SCHED_NORMAL  , NICE   0, AFFINITY 0x1
```
-1

schedtool 1

terminalhacker · 2009-08-06 08:42:03 3
Create .tar file on Mac OS X Leopard / Snow Leopard without ._* files

Using the COPYFILE_DISABLE=true environment variable you can prevent tar from adding any ._-files to your .tar-file on Mac OS X.
This is sample output - yours may be different.
-1

COPYFILE_DISABLE=true tar cvf newTarFile.tar Directory/

alainkaa · 2010-07-01 09:36:48 3
Get full directory path of a script regardless of where it is run from

work for execute file
This is sample output - yours may be different.
-1

dirname $(readlink -f ${BASH_SOURCE[0]})

unixyangg · 2011-12-02 16:10:38 3
Avoid using seq and pad numbers with leading zeros

zsh only I always hated resorting to using $(seq -w 1 99) to pad numbers. zsh provides a shortcut that couldn't be more intuitive. It also works in reverse {99..01} Show Sample Output
This is sample output - yours may be different.
```
001
002
...
998
999
```
-1

for i in {001..999}; print $i

karld · 2009-02-16 23:03:53 7
Random unsigned integer

Grab 4 bytes from www.random.org over ssl and format them as an integer
This is sample output - yours may be different.
-1

curl -s "https://www.random.org/cgi-bin/randbyte?nbytes=4" | od -DAn

PhillipNordwall · 2010-11-09 18:26:24 4
find php files even without extension

needs grep what supports '--recursive' Show Sample Output
This is sample output - yours may be different.
```
./CustomFields/add-avatars.php
./examples/example-widget.php
./examples/multiwidget.php
./examples/Recent_Comments.php
./examples/Recent_Posts.php
```
-1

grep -Ilr "<?php" .

mitry · 2011-10-23 05:11:53 3
Get your external IP address
This is sample output - yours may be different.
-1

html2text http://checkip.dyndns.org | grep -i 'Current IP Address:'|cut -c21-36

tkoopa · 2009-08-06 10:29:02 4
speak a chat log file while it's running

like #9295, but awkish instead of perlish
This is sample output - yours may be different.
-1

tail -f LOGFILE | awk '{system("say \"" $0 "\"");}'

tamouse · 2011-09-16 06:20:06 9
tar the current directory wihtout the absolute path

should do the same as command #12875, just shorter.
This is sample output - yours may be different.
-1

tar -cf "../${PWD##*/}.tar" .

joedhon · 2013-11-06 11:15:38 9
See crontabs for all users that have one

This is not exhaustive but after checking /etc/cron* is a good way to see if there are any other jobs any users may have set. Note: this is a repost from a comment "flatcap" made on http://www.commandlinefu.com/commands/view/3726/print-crontab-entries-for-all-the-users-that-actually-have-a-crontab#comment, for which I am grateful and I take no credit.
This is sample output - yours may be different.
-1

for USER in /var/spool/cron/*; do echo "--- crontab for $USER ---"; cat "$USER"; done

tyzbit · 2014-12-11 19:48:46 15
Load multiple sql script in mysql

Be aware of using the --password argument as it will appear your password in plain text on the screen. You may use -p argument instead, it will prompt you to enter you password in hidden mode.
This is sample output - yours may be different.
-1

cat schema.sql data.sql test_data.sql | mysql -u user --password=pass dbname

tristan_ph · 2009-03-24 08:39:40 6
Find artist and title of a music cd, UPC code given (first result only)

Substitute that 724349691704 with an UPC of a CD you have at hand, and (hopefully) this oneliner should return the $Artist - $Title, querying discogs.com. Yes, I know, all that head/tail/grep crap can be improved with a single sed command, feel free to send "patches" :D Enjoy! Show Sample Output
This is sample output - yours may be different.
```
Iron Maiden - Killers
```
-1

wget http://www.discogs.com/search?q=724349691704 -O foobar &> /dev/null ; grep \/release\/ foobar | head -2 | tail -1 | sed -e 's/^<div>.*>$.*$<\/a><\/div>/\1/' ; rm foobar

TetsuyO · 2011-01-30 23:34:54 3
Generate MD5 of string and output only the hash checksum
This is sample output - yours may be different.
-1

echo -n "String to MD5" | md5sum | awk '{print $1}'

twjolson · 2011-03-05 02:37:28 4
Root Security

This will tighten up security for your box. The default value for PermitRootLogin sadly is 'yes'.
This is sample output - yours may be different.
-1

s=/etc/ssh/sshd_config;r=PermitRootLogin;cp $s{,.old}&& if grep $r $s;then sed "s/$r yes/$r no/" $s.old > $s; else echo $r no >> $s;fi

kzh · 2011-01-30 23:41:59 11
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find directory with most inodes/files

Find which directory in one filesystem that contains most inodes or files.

Install pip with Proxy

Installs pip packages defining a proxy

Make all GUI stuff show up on the display connected to the computer (when you're logged in via SSH)

If you have multiple displays or monitors the DISPLAY environment variable will tell X where to send the output. This is very handy for setting up a mediacenter at home. You can plugin the computer to the TV and then ssh to the computer and set the DISPLAY as above, then run your program and it will show up on the TV.

Change SSH RSA passphrase

Protects your secret identity with a passphrase. OSX 10.6 automatically does key forwarding and can store the passphrase in the keychain. For other OSes, use ssh -A or set ForwardAgent in ssh_config to enable forwarding. Then use ssh-agent/ssh-add.

Export MySQL query as .csv file

This command converts a MySQL query directly into a .csv (Comma Seperated Value)-file.

What is my public IP-address?

Very effective, use only DNS protocol. The @ part is optional if you already set opendns servers as default ns servers.

Database size

Mysql command to list the disk usage of the database

Rotate a single page PDF by 180 degrees

More pdftk examples: http://www.pdflabs.com/docs/pdftk-cli-examples/

Replace spaces in filename

This command will replace spaces in filename with underscore, for all file in directory that contain spaces.

Remove a range of lines from a file

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