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Fast portscanner via xargs
This is sample output - yours may be different.
-1

xargs -i -P 1200 nc -zvn {} 22 < textfile-with-hosts.txt

wuseman1 · 2019-08-25 02:56:52 792
backup file. (for bash)
This is sample output - yours may be different.
-1

cp -p file-you-want-backup{,_`date +%Y%m%d`} # for bash

wbx · 2009-02-08 06:34:46 9
Leap year calculation
This is sample output - yours may be different.
-1

year=2010; math=`echo "$year%4" | bc`; [ ! -z $year ] && [ $math -eq 0 ] && echo "$year is leap year!" || echo "$year isn't leap year";

mvrilo · 2010-03-30 15:33:00 4
Get the amount of currently registered users from i18n.counter.li.org.
This is sample output - yours may be different.
-1

wget -qO - http://i18n.counter.li.org/ | grep 'users registered' | sed 's/.*\<font size=7\>//g' | tr '\>' ' ' | sed 's/<br.*//g' | tr ' ' '\0'

hunterm · 2010-10-07 03:19:17 4
Find out the permissions of the current directory

This will show you the permissions on the directory you are currently in
This is sample output - yours may be different.
-1

ls -lad

techie · 2013-04-03 09:58:31 6
Show who are logging in and what their current commands

Short and sweet command. This command is also useful for other information such as what IP address a particular user logged in from, how long had they been logged in, what shell do they use.
This is sample output - yours may be different.
-1

w

haivu · 2009-03-24 16:03:28 10
easily find megabyte eating files or directories

Thanks for the submit! My alternative produces summaries only for directories. The original post additionally lists all files in the current directory. Sometimes the files, they just clutter up the output. Once the big directory is located, *then* worry about which file(s) are consuming so much space.
This is sample output - yours may be different.
-1

du -kd | egrep -v "/.*/" | sort -n

rmbjr60 · 2010-03-30 15:40:35 3
find the device when you only know the mount point
This is sample output - yours may be different.
-1

mount | grep "mount point"

mimivx · 2011-01-31 10:21:09 2
Batch file suffix renaming

replace the "-" by the character you wish. If you have multiple extentions, like jpef, jpg and JPG you could use mmv "*-*.*" "#1.#3"
This is sample output - yours may be different.
-1

mmv "*-*.mp3" "#1.mp3"

houghi · 2011-03-06 13:41:54 3
Generate an XKCD #936 style 4 word password

If you do not have shuf or an -R option in sort, you can fall back on awk. This provides maximum portability IMO. The command first collects words from the dictionary that match the criteria - in this case: lower case words with no punctuation that are 4 to 8 characters long. It then prints 4 random entries. I decided to print each word on a separate line to improve readability.
This is sample output - yours may be different.
-1

awk 'BEGIN {srand} /^[a-z]{4,8}$/ {w[i++]=$0} END {while (j++<4) print w[int(rand*i)]}' /usr/share/dict/words

putnamhill · 2011-08-18 02:09:42 3
Add together the count of users from the international Linux Counter and the dudalibre.com counter.

The command was too long for the command box, so here it is: echo $(( `wget -qO - http://i18n.counter.li.org/ | grep 'users registered' | sed 's/.*\<font size=7\>//g' | tr '\>' ' ' | sed 's/<br.*//g' | tr ' ' '\0'` + `curl --silent http://www.dudalibre.com/gnulinuxcounter?lang=en | grep users | head -2 | tail -1 | sed 's/.*<strong>//g' | sed 's/<\/strong>.*//g'` )) This took me about an hour to do. It uses wget and curl because, dudalibre.com blocks wget, and wget worked nicely for me. Show Sample Output
This is sample output - yours may be different.
```
138362
```
-1

Check the Description below.

hunterm · 2010-10-07 04:22:32 3
Find invalid \uxxxx Unicode escape sequences in Java source code

Get 'ack' now at http://betterthangrep.com/
This is sample output - yours may be different.
-1

ack --java '\\u.?.?.?[^0-9a-fA-F]'

hfs · 2012-06-06 08:31:56 8
List directories sorted by size
This is sample output - yours may be different.
-1

du -sh * | sort -h

sergeylukin · 2015-09-14 10:24:06 11
FINDING PCI DEVICES
This is sample output - yours may be different.
-1

/sbin/lspci (-v is verbose)

tyjuan79 · 2010-07-02 15:27:37 4
vim insert at beginning of multiple lines
This is sample output - yours may be different.
-1

:%s!^!foo!

miccaman · 2011-04-13 11:57:18 5
Weather

Grabs the current weather in your area (or their best guess of your area). Change the query to your zip code/location (e.g. google.com/search?q=weather+jakarta,+india) to get weather somewhere else. change google.com to google.ca or google.co.uk for metric. Show Sample Output
This is sample output - yours may be different.
```
33?F
```
-1

wget -qO- -U '' 'google.com/search?q=weather' | grep -oP '(-)?\d{1,3}\xB0[FC]'

slaufer · 2012-02-28 22:27:38 363

detect partitions

List all disks and all of their partitions on OS X. http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man8/diskutil.8.html Show Sample Output

This is sample output - yours may be different.

/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *750.2 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS swap                    32.0 GB    disk0s2
   3: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF               536.9 MB   disk0s3
   4:                  Apple_HFS spare                   671.1 MB   disk0s4
   5:          Apple_CoreStorage                         99.5 GB    disk0s5
   6:                 Apple_Boot Boot OS X               650.0 MB   disk0s6
   7:          Apple_CoreStorage                         616.3 GB   disk0s7
   8:                 Apple_Boot Boot OS X               134.2 MB   disk0s8
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS OS                     *99.2 GB    disk1
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *616.0 GB   disk2
   1:                        EFI                         209.7 MB   disk2s1
   2:                        ZFS                         615.7 GB   disk2s2
/dev/disk3
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:             zfs_pool_proxy gjp22                  *614.2 GB   disk3
/dev/disk4
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *640.1 GB   disk4
   1:                        EFI                         209.7 MB   disk4s1
   2:                        ZFS                         639.8 GB   disk4s2
/dev/disk5
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:             zfs_pool_proxy zhandy                 *635.7 GB   disk5
   1:       zfs_filesystem_proxy Pocket Time Machine     85.1 GB    disk5s1
/dev/disk7
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk7
   1:                        EFI                         209.7 MB   disk7s1
   2:                        ZFS                         2.0 TB     disk7s2
/dev/disk8
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:             zfs_pool_proxy tall                   *2.0 TB     disk8
   1:       zfs_filesystem_proxy backups                 62.4 GB    disk8s1
   2:       zfs_filesystem_proxy LaCie d2 Extreme        50.7 GB    disk8s1s1
   3:       zfs_filesystem_proxy 11G                     50.7 GB    disk8s1s1s1
   4:       zfs_filesystem_proxy 12A                     50.7 GB    disk8s1s1s2
   5:       zfs_filesystem_proxy blocky                  54.2 GB    disk8s1s2
   6:       zfs_filesystem_proxy gjp22                   376.0 GB   disk8s1s3
   7:       zfs_filesystem_proxy zhandy                  478.3 GB   disk8s1s4
   8:       zfs_filesystem_proxy Pocket Time Machine     107.4 GB   disk8s1s4s1

-1

diskutil list

grahamperrin · 2012-10-06 21:18:27 6

Binary digits Matrix effect

Adapted from http://stackoverflow.com/questions/13611501/bash-version-of-c64-code-art-10-print-chr205-5rnd1-goto-10 Show Sample Output

-1

yes 'c=(" " " " " " 0 1); printf "${c[RANDOM%5]}"' | bash

stx · 2013-11-09 16:10:41 6

generate random password

A slightly shorter version. Also doesn't put a return character at the end of the password
This is sample output - yours may be different.
-1

tr -dc 'a-zA-Z0-9' < /dev/urandom | head -c10

Phil · 2009-12-01 14:22:20 4
Get a file from SharePoint with cURL

If you know the URL of a file on a SharePoint server, it's just a matter of logging in with your AD credentials to get the file with cURL
This is sample output - yours may be different.
-1

curl --ntlm -u DOMAIN/user https://sharepoint.domain.com/path/to/file

sud0er · 2010-11-11 22:22:24 182
create html output from colored, word-level git diff

references: http://stackoverflow.com/questions/8818789/git-diff-word-diff-with-oneline-files use aha to output html: http://stackoverflow.com/a/20861333/199217
This is sample output - yours may be different.
-1

git diff --word-diff --color-words | aha > index.html && firefox index.html

dlebauer · 2015-04-20 15:24:56 10
Sweep and download all mp3 (in French) of Rendez-vous avec X (Meet with Mr. X) of the French public radio

Sweep and download all mp3 (in French) of "Rendez-vous avec X" (Meet with M. X) of French public radio From 1997 http://rendezvousavecmrx.free.fr/audio/mr_x_1997_01_04.mp3 To 2015 http://rendezvousavecmrx.free.fr/audio/mr_x_2015_06_20.mp3 Balaye et telecharge les episodes depuis 1997 http://rendezvousavecmrx.free.fr/audio/mr_x_1997_01_04.mp3 jusqu'en 2015 http://rendezvousavecmrx.free.fr/audio/mr_x_2015_06_20.mp3
This is sample output - yours may be different.
-1

wget http://rendezvousavecmrx.free.fr/audio/mr_x_{1997..2015}_{01..12}_{01..31}.mp3

pascalvaucheret · 2015-08-13 21:34:50 12
Empty a file
This is sample output - yours may be different.
-1

truncate foobar.txt

w216 · 2009-12-29 01:52:12 3
Slideshow of images in the current folder

-d Draw the filename at the top-left of the image -F fullscreen -z randomize -D 1 - delay 1 second between changing slides This command will show images in subdirectories as well.
This is sample output - yours may be different.
-1

feh -d -F -z -D 1 *

ivanatora · 2010-02-26 11:06:11 4
Command line calculator

This is an "argument calculator" funktion. The precision is set to 4 and you can use dot (.) or comma (,) as decimal mark (which is great for german users with a comma on the numpad).
This is sample output - yours may be different.
-1

calc() { echo "scale=4; ${*//,/.}" | bc -l; }

fpunktk · 2011-10-24 19:58:20 4
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Record camera's output to a avi file

video.avi is the resulting file. Press Ctrl+c to stop the recording. You can change the OVC option to another to record into a different format.

The simplest way to transport information over a network

Einstein's razor: As simple as possible, but not simpler. On the destination machine netcat listens on any port (1234 in the example) and sends anything it receives into a file or pipe. On the source machine a separate netcat takes input from a file or pipe and sends it over the network to the listener. This is great between machines on a LAN where you don't care about authentication, encryption, or compression and I would recommend it for being simpler than anything else in this situation. Over the internet you should use something with better security.

Emulating netcat -e (netcat-traditional or netcat-openbsd) with the gnu-netcat

Then just nc servername 2600 and ./script.sh kill the client with ctrl+c. You can reconnect several times. kill the server with exit

Copy recursivelly files of specific filetypes

Copying only wmv and mpg files recursively from to

Send a backup job to a remote tape drive on another machine over SSH

I use this all the time for taking manual backups of stuff i want to keep but not important enough to backup regularly.

Set file access control lists

The file myfile is owned by tom and has read and write permissions for tom. Group and other permissions are empty which make myfile readable and writable only by tom. setfacl enables user tom to give read permission to user john only. The command 'ls -l' shows a '+' sign telling us that file access control list has been setup for myfile.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Find your graphics chipset

Displays only the VGA adapter/chipset being used for the graphics. In this case, it gave me the "M22" and "Mobility Radeon x300" that I needed to research a graphics issue I was having.

Go to parent directory of filename edited in last command

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"

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