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Rickroll your users who try to sudo
This is sample output - yours may be different.
-2

echo "alias sudo=\"aplay annoyingsoundfile.ogg\"" >> .bash_aliases

Davidc3 · 2010-06-16 10:20:15 5
cut with tab or other white space chars

cut -f1 -d\<TAB>
This is sample output - yours may be different.
-2

cut -f1 -d"<TAB>"

dennisfaust · 2011-05-05 18:17:36 6
Get the rough (german) time from Twitter

EXACT time in Germany. :) Show Sample Output
This is sample output - yours may be different.
```
Berlin Date/Time is Sun 19 Jun 2011 04:35:30 AM GMT
```
-2

echo -e "Berlin Date/Time is" `TZ=GMT-2 /bin/date \+%c`

Habitual · 2011-06-19 02:40:31 3
Convert images (foo.gif => foo.jpg)
This is sample output - yours may be different.
-2

for i in **/*.gif; convert $i $i:r.jpg

int9h · 2009-02-18 22:29:33 5
count how many cat processes are running
This is sample output - yours may be different.
-2

pgrep -c cat

dog · 2010-09-23 11:57:46 3
Rename all files which contain the sub-string 'foo', replacing it with 'bar'
This is sample output - yours may be different.
-2

rename foo bar filename

hexram · 2011-05-05 23:31:55 4
Get the rough (german) time from Twitter by @zurvollenstunde

Calc the rough time from Twitter. Now with leading Zeroes. Show Sample Output
This is sample output - yours may be different.
```
20:11
```
-2

printf "%02d:%02d\n" $(curl -s "http://search.twitter.com/search?from=zurvollenstunde&rpp=1" | grep -E '(Es ist jetzt|ago)' | sed 's/<[^>]*>//g;s/[^[:digit:]]//g' | xargs )

torrid · 2011-06-19 18:16:00 3
Bulk copy large blocks of data between File Systems (run as root iff you do not own all of the files!)

Using tape archive create a tar file in Stdout (-) and pipe that into a compound command to extract the tar file from Stdin at the destination. This similar to "Copy via tar pipe ...", but copies across file systems boundaries. I prefer to use cp -pr for copying within the same file system. Show Sample Output
This is sample output - yours may be different.
```
Script started on Sun Sep 20 13:07:18 2009
$ pwd
/Volumes/Photos1/Users/Videos/PixelPerfect
$ du -sh 2006
1.1G	2006
$ ls -1R 2006 | wc -l
      15
$ tar cpof - 2006 |( cd ~/Videos/; tar xpof -)
$ du -sh !$
$ du -sh ~/Videos/2006
1.1G	/Users/davidpotter42/Videos/2006
Script done on Sun Sep 20 13:11:37 2009
```
-2

tar cpof - src |( cd des; tar xpof -)

davidpotter42 · 2009-09-20 20:43:30 3
count how many cat processes are running
This is sample output - yours may be different.
-2

ps -cx cat

krissi · 2010-09-23 12:28:07 3
Write in a text file the contents of all the zip files in a directory.

It can be used to create an index of a backup directory or to find some file.
This is sample output - yours may be different.
-2

for file in *.zip; do unzip -l "$file" >> archiveindex.txt ; done;

chon8a · 2013-05-02 01:43:26 7
Get your external IP address

Here's a version that uses netcat (although I'd much rather use curl!).
This is sample output - yours may be different.
-2

echo -e "GET /ip HTTP/1.0\nUser-Agent: netcat\nHOST: ifconfig.me\n\n" | nc ifconfig.me 80 | sed -n '/^[0-9]/p'

putnamhill · 2010-06-16 19:08:05 3
Remove executable bit from all files in the current directory recursively, excluding other directories, firm permissions
This is sample output - yours may be different.
-2

find . -type f -exec chmod 640 {} ';'

lionping · 2010-07-18 21:03:38 4
x86info

specific information about your intel CPUs in your system and their features
This is sample output - yours may be different.
-2

x86info

theIndianMaiden · 2009-08-16 02:19:39 3
View external IP
This is sample output - yours may be different.
-2

wget -q ip.nu && cat index.html

VictorBjelkholm · 2012-03-23 03:14:37 3
Pipe ls output into less

This is useful for paging through long directories, mulitple directories, etc. I put this in my ~/.bash_aliases file and alias 'lsl' to it.
This is sample output - yours may be different.
-2

function lsless() { ls "$@" | less; }

argherna · 2009-11-13 17:28:06 7
Wait for an already launched program to stop before starting a new command.

The '[r]' is to avoid grep from grepping itself. (interchange 'r' by the appropriate letter) Here is an example that I use a lot (as root or halt will not work): while (ps -ef | grep [w]get); do sleep 10; done; sleep 60; halt I add the 'sleep 60' command just in case something went wrong; so that I have time to cancel. Very useful if you are going to bed while downloading something and do not want your computer running all night.
This is sample output - yours may be different.
-2

while (ps -ef | grep [r]unning_program_name); do sleep 10; done; command_to_execute

m_a_xim · 2010-01-14 16:26:34 3

Find everything updated in the last minute recursively within the current directory and sort by time, newest at the bottom.

Provides a recursive time ordered list of the current directory over the last 3 minutes. Excluding zero byte files: ls -lF -darth `find . -size +0 -mmin -3` For the last day's files, change "-mmin -3" to "-mtime -1": ls -lF -darth `find . -size +0 -mtime -1` Show Sample Output

-2

ls -lF -darth `find . -mmin -3`

UncleLouie · 2014-03-22 16:52:20 7

import database
This is sample output - yours may be different.
-2

mysql>use DBNAME; mysql>source FILENAME

teloon · 2010-03-19 10:21:40 5
counting a particular character in a file
This is sample output - yours may be different.
-2

fold -w 1 <file> | grep -c <character>

KeePon · 2010-09-23 16:30:33 3
Find/Replace in a bunch of files and keep a log of the changes

This is a more concise answer to http://blog.commandlinekungfu.com/2011/09/episode-158-old-switcheroo.html in my opinion.
This is sample output - yours may be different.
-2

find . -type f | xargs grep -n "Old Text" | tee filesChanged.txt | sed 's/:.*$//' | xargs sed -i 's/Old Text/New Text/g

moogmusic · 2011-09-06 10:28:36 3
Find out if a module is installed in perl

This version uses a bash function and does not print the path to the module. Show Sample Output
This is sample output - yours may be different.
```
$ module_exists diagnostics && echo yes || echo no
yes

$ module_exists beeblebrox && echo yes || echo no
no
```
-2

module_exists(){ perl -e 'use '$1 2>/dev/null; }

putnamhill · 2013-01-11 14:47:07 4
Remove the Apple quarantine

When downloading files on a Mac, Apple adds the x-attribute: com.apple.quarantine. Often, this makes it so you can't even run a ./configure. This command gets rid of the quarantine for all files in the current directory.
This is sample output - yours may be different.
-2

find . | xargs xattr -d com.apple.quarantine

brockangelo · 2012-05-09 23:06:51 8
generate /etc/shadow-style password

Show Sample Output
This is sample output - yours may be different.
```
$1$saltsalt$J9FHdD60EASotLk.KSSI4/
```
-2

mkpasswd -5 pa33w0rd saltsalt

kev · 2011-11-16 16:24:18 9
Get the IP address
This is sample output - yours may be different.
-2

ifconfig | awk -F"[: ]+" '/inet addr/ {print $4}'

saibbot · 2012-07-16 07:48:33 3
Create a mysql database from the command line

Creates a database that could then be populated with a dump file or application. Show Sample Output
This is sample output - yours may be different.
```
No output unless verbose
```
-2

mysqladmin -u username -p create dbname

vaporub · 2009-02-16 07:21:07 71
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Test disk I/O

Especially useful to gauge the performance of a VPS.

sum numbers in the file (or stdin)

add integers from the stdin and print out the result usually, cat /tmp/file | echo $(($(tr '\n' '+')0))

replace strings in file names

Uses vi style search / replace in bash to rename files. Works with regex's too (I use the following a script to fixup / shorten file names): # Remove complete parenthetical/bracket/brace phrases rename 's/$.*$//g' * rename 's/\[.*\]//g' * rename 's/\{.*\}//g' *

Convert from a decimal number to a binary number

Create arbitrary big file full of zeroes but done in a second

If you want to create fast a very big file for testing purposes and you do not care about its content, then you can use this command to create a file of arbitrary size within less than a second. Content of file will be all zero bytes. The trick is that the content is just not written to the disk, instead the space for it is somehow reserved on operating system level and file system level. It would be filled when first accessed/written (not sure about the mechanism that lies below, but it makes the file creation super fast). Instead of '1G' as in the example, you could use other modifiers like 200K for kilobytes (1024 bytes), 500M for megabytes (1024 * 1024 bytes), 20G for Gigabytes (1024*1024*1024 bytes), 30T for Terabytes (1024^4 bytes). Also P for Penta, etc... Command tested under Linux.

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" }

Rename files in batch

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

list files recursively by size

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