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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 02:56:52 736
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 22:27:38 362

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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Create a new file

generate iso

Download all manuals RedHat 7 (CentOS/Fedora) with one command in Linux

prints line numbers

Interactively build regular expressions

txt2regex can be interactive or noninteractive and generates regular expressions for a variety of dialects based on user input. In interactive mode, the regex string builds as you select menu options. The sample output here is from noninteractive mode, try running it standalone and see for yourself. It's written in bash and is available as the 'txt2regex' package at least under debian/ubuntu.

Transfer SSH public key to another machine in one step

This command sequence allows simple setup of (gasp!) password-less SSH logins. Be careful, as if you already have an SSH keypair in your ~/.ssh directory on the local machine, there is a possibility ssh-keygen may overwrite them. ssh-copy-id copies the public key to the remote host and appends it to the remote account's ~/.ssh/authorized_keys file. When trying ssh, if you used no passphrase for your key, the remote shell appears soon after invoking ssh user@host.

Simple addicting bash game.

Really bored during class so I made this... Basically, you hold period (or whatever) and hit enter after a second and you need to make the next line of periods the same length as the previous line... My record was 5 lines of the same length. It's best if you do it one handed with your pointer on period and ring on enter.

List recorded formular fields of Firefox

When you fill a formular with Firefox, you see things you entered in previous formulars with same field names. This command list everything Firefox has registered. Using a "delete from", you can remove anoying Google queries, for example ;-)

synchronicity

The British Government entering in the Gregorian era.

move all files older than 60 days to a folder

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