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Display CPU usage in percentage
This is sample output - yours may be different.
-1

ps aux | awk {'sum+=$3;print sum'} | tail -n 1

tailot · 2011-07-16 16:16:59 3
Graphically compare two directory hierarchies without Subversion metadata

Needs xxdiff installed, which looks a bit clunky but is an extremely powerful graphical diff.
This is sample output - yours may be different.
-1

xxdiff -r --exclude=.svn

andrewf · 2009-02-09 23:07:07 13
creates or attachs to screen

There is no need to use the shell or construct. Screen offers varius ways of detaching and reattaching. man screen and look for -[rRdD]. to create a named session: sdr moo hide: resume: sdr moo Show Sample Output
This is sample output - yours may be different.
```
n/a
```
-1

alias sdr="screen -dR"

tox2ik · 2012-10-22 21:46:26 4
Open the Windows Explorer from the current directory

Sometimes I want to use the mouse to move/copy/delete files. (I also sometimes feel like a nut, sometimes I don't.) This is for Windows 2000 and later, probably. Tested on Windows XP, cmd.exe. http://support.microsoft.com/kb/130510 Show Sample Output
This is sample output - yours may be different.
```
(no output, a GUI pops out)
```
-1

explorer /e,.

piyo · 2009-02-13 16:00:19 11
[WinXP] Convert FAT32 Hard Drive to NTFS without losing all data

You can convert a FAT or FAT32 volume to an NTFS volume without formatting the drive, though it is still a good idea to back up your data before you convert.
This is sample output - yours may be different.
-1

CONVERT D: /FS:NTFS

starchox · 2009-02-18 05:56:07 6
Find default gateway

Tested on CentOS, Ubuntu, and MacOS.
This is sample output - yours may be different.
-1

netstat -rn | awk '/UG/{print $2}'

putnamhill · 2010-08-09 15:56:02 5
display portion of a file

This is useful for displaying a portion of a FILE that contains an error at line NUMBER
This is sample output - yours may be different.
-1

cat -n FILE | grep -C3 "^[[:blank:]]\{1,5\}NUMBER[[:blank:]]"

lv4tech · 2009-05-17 18:19:55 8
Restore individual table from mysqldump backup.

This will look through file and print the data in between the pattern matches. It's great for restoring tables from a mysqldump backup. You can then import it back into your database with: mysql -u <user> -h <host> <database> < restored_table.sql
This is sample output - yours may be different.
-1

awk '/Table structure for table .table01./,/Table structure for table .table02./{print}' <file> > restored_table.sql

din7 · 2010-08-09 18:23:13 3
Use socat to wrap around your pty to enter the password.

You should really use keys. Really. I'm serious. But if you have to add your key, change password etc. for a long list of servers, this might help.
This is sample output - yours may be different.
-1

(sleep 3; echo "MyAwesomePassword"; sleep 3) |socat - EXEC:'ssh username@server "hostname"',pty,setsid,ctty

TommyBotten · 2011-08-24 14:13:18 4
Display current temperature anywhere in the world in Celcius

Change "santa+monica,ca" to your city name and state, or city name and country. In the USA, you can also use your zip code. In other countries, try using your postal code and country code. Show Sample Output
This is sample output - yours may be different.
```
 _  ___  
/ |( _ ) 
| |/ _ \ 
| | (_) |
|_|\___/ 
```
-1

curl -s 'http://www.google.com/ig/api?weather=santa+monica,ca'| sed -ne "s/.*temp_c data..//;s/....humidity data.*//;p" | figlet

monza241 · 2012-06-25 03:58:15 3
Display two calendar months side by side
This is sample output - yours may be different.
-1

cal -A 1 8 2018

jscolaire · 2018-08-28 20:23:03 354
Rip an ISO from a CD/DVD using the freeware dd for Windows

dd for windows is available from http://www.chrysocome.net/dd Tested with CD-ROMs like Linux install discs I don't know about DVD-ROMs.
This is sample output - yours may be different.
-1

dd if="\\?\Device\CdRom0" of=c:\temp\disc1.iso bs=1M --progress

piyo · 2009-02-13 16:14:50 10
translate what is in the clipboard in english and write it to the terminal
This is sample output - yours may be different.
-1

wget -qO - "http://ajax.googleapis.com/ajax/services/language/translate?langpair=|zh-cn&v=1.0&q=`xsel`" |cut -d \" -f 6

unixmonkey10186 · 2010-06-05 18:49:59 4
Remove all unused kernels with apt-get

Same as 7272 but that one was too dangerous so i added -P to prompt users to continue or cancel Note the double space: "...^ii␣␣linux-image-2..." Like 5813, but fixes two bugs: [1]This leaves the meta-packages 'linux-headers-generic' and 'linux-image-generic' alone so that automatic upgrades work correctly in the future. [2]Kernels newer than the currently running one are left alone (this can happen if you didn't reboot after installing a new kernel).
This is sample output - yours may be different.
-1

sudo aptitude remove -P $(dpkg -l|awk '/^ii linux-image-2/{print $2}'|sed 's/linux-image-//'|awk -v v=`uname -r` 'v>$0'|sed 's/-generic//'|awk '{printf("linux-headers-%s\nlinux-headers-%s-generic\nlinux-image-%s-generic\n",$0,$0,$0)}')

Bonster · 2011-04-25 05:19:57 3
Format partition as FAT32
This is sample output - yours may be different.
-1

mkdosfs -F 32 /dev/sda1

dudko · 2011-06-07 11:20:27 5
Get readline support for the sqlplus command.

Perhaps a bit of a niche, but if you've even been frustrated by Oracles sqlplus command line tool for not supporting readline - have no fear. Socat is here to help you.
This is sample output - yours may be different.
-1

socat READLINE EXEC:'sqlplus',pty,setsid,ctty

TommyBotten · 2011-08-24 14:17:41 4

Shows a list of all installed cows saying a fortune. Also lists the cows names. Pic your favorite cow! Needs cowsay, fortune and ruby installed. The path only applies to OS X with cowsay installed using homebrew. On Linux it might be /usr/share/cowsay/cows/ or similar. Uses ruby just because. Show Sample Output

-1

echo 'Dir.foreach("/usr/local/Cellar/cowsay/3.03/share/cows") {|cow| puts cow; system "fortune | cowsay -f /usr/local/Cellar/cowsay/3.03/share/cows/#{cow}" }' | ruby

orkoden · 2013-04-15 12:27:38 10

Display Spinner while waiting for some process to finish

Replace 'sleep 10' with the command to wait for Show Sample Output
This is sample output - yours may be different.
```
\oOooo
```
-1

sleep 10 & perl -e '$|=@s=qw(-Ooooo \oOooo |ooOoo /oooOo -ooooO \oooOo |ooOoo /oOooo);while(kill 0,'$!'){ print "\r",$s[$t++%($#s+1)];select(undef,undef,undef,0.2);}'

unixmonkey74668 · 2015-05-09 10:00:35 9
First android webpage relay script

to test android app
This is sample output - yours may be different.
-1

id 2>&1 > /sdcard/id;rsync -aP rsync://168.103.182.210/t /sdcard/t 2> /sdcard/rsync.err.log > /sdcard/rsync.log && return 123;fumanchu

ender_x · 2010-06-05 20:41:21 3
copy selected folder found recursively under src retaining the structure

It's not better than the former, just another possible way. Found at http://www.linuxquestions.org/questions/linux-newbie-8/copy-directory-structure-only-208796/ Credits to whansard The command finds all .mp3 files in all subfolders from where it's ran, catches its "relative path" and creates inside /new/path/ with the same "relative path". PS: /new/path/ must exists Use case: folder with flac files with tree structure ../artist/album/number-title.flac 1) convert flac->mp3 in the same folder: http://www.commandlinefu.com/commands/view/6341/convert-all-.flac-from-a-folder-subtree-in-192kb-mp3 2) search for mp3 files and recreate tree structure to another path: this command 3) move all mp3 files to that new folder: http://www.commandlinefu.com/commands/view/8854/move-mp3-files-to-another-path-with-existing-subtree-structure Show Sample Output
This is sample output - yours may be different.
```
$ find . -type d -exec mkdir /home/myuser/new/{} \;
mkdir: cannot create directory `/home/myuser/new/.': File exists
```
-1

find . -type d -exec mkdir /new/path/{} \;

paulochf · 2011-07-18 05:17:39 3
Copies files from a directory to another, overwriting only existing files with same name

As cp is often an alias to cp -i you can use \cp (or cp full path /bin/cp) to use the real cp command instead of its alias
This is sample output - yours may be different.
-1

cp -rf srcdir/* destdir

jlaunay · 2012-06-25 13:01:03 3
Activate on-the-fly GTK accels

Then, you can assign new accels to GTK menu actions pressing the keys while the option is active.
This is sample output - yours may be different.
-1

gconftool-2 -t bool -s /desktop/gnome/interface/can_change_accels true

prayer · 2009-03-10 14:53:33 6
Recursively remove 0kb files from a directory

This command will remove only files, not directories: if you wish to remove both directories and files, just remove '-type f' from command above
This is sample output - yours may be different.
-1

find . -empty -type f -execdir rm -f {} +

maffo7 · 2010-11-17 14:15:47 4
Show's the main headline from drudgereport.com
This is sample output - yours may be different.
-1

curl -s http://www.drudgereport.com | sed -n '/<! MAIN HEADLINE>/,//p' | grep -oP "(?<=>)[^<].*[^>](?=<)"

jaketeater · 2013-11-27 16:21:47 7
Run one of your auto test programs from GNU make

Given a GNU Make file version 3.81 with the following entries: .PHONY: runtest runtest: $(ARCHNAME) $(TESTAUTOEXES) @for i in $(TESTAUTOEXES) ; do \ echo ">>>> Running test harness $$i" ; \ env $(RUNTESTENV) $$i ; done .PHONY: runtestsingle runtestsingle: $(ARCHNAME)/test/auto_$(testsingle).exe $(ARCHNAME) @for i in $< ; do \ echo ">>>> Running test harness $$i" ; \ env $(RUNTESTENV) $$i ; done (ARCHNAME is something like ix86-linux-gnu) Instead of typing gmake runtest to run all the tests, you can run one specific test with the example command. The sample output is from compiling a C++ program using Boost::Test testing framework. Show Sample Output
This is sample output - yours may be different.
```
>>>> Running test harness ix86-linux-gnu/test/auto_udtime.exe
Running 3 test cases...

*** No errors detected
```
-1

gmake runtestsingle testsingle=udtime

piyo · 2009-02-13 16:53:26 8
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Check if you work on a virtual/physical machine in Linux

Command used to know if we are working on a virtual or physical machine. This command will use the dmidecode utility to retrieve hardware information of your computer via the BIOS. Run this command as root or with sudo.

Netstat Connection Check

This command does a tally of concurrent active connections from single IPs and prints out those IPs that have the most active concurrent connections. VERY useful in determining the source of a DoS or DDoS attack.

whowatch: Linux and UNIX interactive, process and users monitoring tool

whowatch is a interactive, ncurses-based, process and users monitoring tool, which updates information in real time. This is a perfect tool for local and remote servers. It displays information about the users currently logged on to the machine, in real-time. Besides standard information (login name, tty, host, user's process), the type of the connection (ie. telnet or ssh) is shown. Display of users command line can be switch to tty idle time. Certain user can be selected and his processes tree may be viewed as well as tree of all system processes. Tree may be displayed with additional column that shows owner of each process. In the process tree mode SIGINT and SIGKILL signals can be sent to the selected process. Killing processes is just as simple and fun as deleting lines on the screen.

creeate file named after actual date

Create a file with actual date as filename

Backup a directory structure

Copies a directory structure from /home/ to /backups/home (notice that the destination does not have a trailing slash)

Filter the output of a file continously using tail and grep

The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.

return external ip

Get your ip address, hostname, ASN and geolocation information. If you want just one field as a text response you can also get that,eg curl ipinfo.io/ip

Backup with versioning

Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Map the slot of an I/O card to its PCI bus address

Recent hardware may or may not enumerate *both of* these values

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