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Spoof your wget referring url
This is sample output - yours may be different.
0

H="--header"; wget $H="Accept-Language: en-us,en;q=0.5" $H="Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" $H="Connection: keep-alive" -U "Mozilla/5.0 (Windows NT 5.1; rv:10.0.2) Gecko/20100101 Firefox/10.0.2" --referer=urlhere

theabarnes · 2014-10-17 04:22:07 8
Convert JSON to YAML (unicode safe)
This is sample output - yours may be different.
0

json_xs -t yaml < foo.json > foo.yaml

chrapek · 2015-01-29 13:48:34 9
Create OS X install USB via one step CLI

If you've upgraded to OS X 10.10.x the OS installer should be on your system, otherwise its a free download (~ 5 GB). Added bonus, the above command does not require the USB pre-formatted. Show Sample Output
This is sample output - yours may be different.
```
Erasing Disk: 0%... 10%... 20%... 30%...100%...
Copying installer files to disk...
Copy complete.
Making disk bootable...
Copying boot files...
Copy complete.
Done.
```
0

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app/ --nointeraction

justinf · 2015-05-24 08:03:41 12
Write random data to a disk, quickly

Due to @tremby, here: http://unix.stackexchange.com/a/172088/58343. I'm looking for a way to parallelize openssl and feed that to dd since openssl is the bottleneck on my machine: http://unix.stackexchange.com/questions/253466/parallelize-openssl-as-input-to-dd
This is sample output - yours may be different.
0

openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | pv --progress --eta --rate --bytes --size 8000632782848 | dd of=/dev/md0 bs=2M

diagon · 2016-01-05 19:36:03 20
Delete all Vagrant boxes

Combs through your home directory and destroys all Vagrant boxes.
This is sample output - yours may be different.
0

find $HOME -type d -name .vagrant | xargs -i% bash -c "pushd %; cd ..;vagrant destroy -f; popd"

gtirloni · 2016-10-06 17:02:20 17
Find latest modified log
This is sample output - yours may be different.
0

find . -name '*.log' | xargs ls -hlt > /tmp/logs.txt && vi /tmp/logs.txt

zluyuer · 2017-07-07 05:13:51 20
Toggle the Touchpad on or off
This is sample output - yours may be different.
0

tp=$(synclient -l | grep TouchpadOff | awk '{ print $3 }') && tp=$((tp==0)) && synclient TouchpadOff=$tp

jny · 2018-10-09 07:42:32 375
replace @ symbol with new line character, to get new line character press Ctrl+v+enter --> ^M

replace @ symbol with new line character, to get new line character press Ctrl+v+enter --> ^M
This is sample output - yours may be different.
0

%s/@/^v[M]/g

xraj · 2009-09-17 11:47:24 4
Show a script or config file without comments
This is sample output - yours may be different.
0

egrep -v "^[[:blank:]]*($|#|//|/\*| \*|\*/)" somefile

sdadh01 · 2009-11-10 18:49:19 5
View a random xkcd comic

Only need to install Image Magick package. Display a xkcd comic with its title and save it in /tmp directory If you prefer to view the newest xkcd, use this command: wget -q http://xkcd.com/ -O-| sed -n '/<img src="http:\/\/imgs.xkcd.com\/comics/{s/.*$http:.*$" t.*/\1/;p}' | awk '{system ("wget -q " $1 " -O- | display -title $(basename " $1") -write /tmp/$(basename " $1")");}'
This is sample output - yours may be different.
0

wget -q http://dynamic.xkcd.com/comic/random/ -O-| sed -n '/<img src="http:\/\/imgs.xkcd.com\/comics/{s/.*$http:.*$" t.*/\1/;p}' | awk '{system ("wget -q " $1 " -O- | display -title $(basename " $1") -write /tmp/$(basename " $1")");}'

laugg · 2009-12-09 13:41:25 7
Show the command line of a process that use a specific port (ubuntu)

A way not so simple but functional for print the command for the process that's listening a specific port. I got the pid from lsof because I think it's more portable but can be used netstat netstat -tlnp Show Sample Output
This is sample output - yours may be different.
```
java -Dcom.sun.management.jmxremote -Xmx1024m -XX:MaxPermSize=300m -server -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8885 -jar /oc4j/j2ee/home/oc4j.jar 
```
0

port=8888;pid=$(lsof -Pan -i tcp -i udp | grep ":$port"|tr -s " " | cut -d" " -f2); ps -Afe|grep "$pid"|grep --invert-match grep | sed "s/^$[^ ]*[ ]*$\{7\}$.*$$/\2/g"

glaudiston · 2010-01-11 17:49:22 8
Status of Snow Armageddon in Washington DC Metro from the command line...

The Washington DC Metro area is not accustomed to getting large snow storms... http://snowpocalypsedc.com/
This is sample output - yours may be different.
0

/usr/bin/links --source http://weather.noaa.gov/pub/data/forecasts/zone/md/mdz009.txt

SuperFly · 2010-02-05 17:44:45 3
List a phone's filesystem with bitpim

This will list your phone's filesystem with bitpim. (works on many LG, Samsung, and Sanyo) See http://www.bitpim.org/help/phones-featuressupported.htm for full list.
This is sample output - yours may be different.
0

bitpim -p $PHONE_PORT ls

matthewbauer · 2010-04-09 02:20:53 10
shutdown pc in a 4 hours

((60 * 4)) will be turned into 240 by bash before being input to the shutdown command, replace the 4 with whatever number of hours you want, let bash do the math.
This is sample output - yours may be different.
0

shutdown -h $((60 * 4))

retrodanny · 2011-05-02 07:10:10 3
batch download jpgs which are in sequence
This is sample output - yours may be different.
0

curl -O http://www.site.com/img/image[001-175].jpg

kev · 2011-11-09 10:19:24 4
Show all archives.

That command make the same that "ls -a", but just typping "la". Tested in bash.
This is sample output - yours may be different.
0

la

rock_neurotiko · 2011-12-18 15:48:03 3
open a screenshot of a remote desktop via ssh

More stealthy ffmpeg method. The imagemagick 'import' method causes a system beep.
This is sample output - yours may be different.
0

ssh user@host "ffmpeg -f x11grab -s 1920x1080 -i :0 -r 1 -t 1 -f mjpeg -" | display

buhrietoe · 2012-05-01 04:45:15 3
Flush DNS in Mac OS X
This is sample output - yours may be different.
0

dscacheutil ?flushcache

edshadi · 2012-07-04 17:04:52 3
SoftHangup --Request a hangup on a given channel - in Asterisk 1.6.2:

If a call get hanged , one can disconnect the call using the above command i.e "soft hangup . The Zap/1-1 is the name of the Channel , you wish to disconnect. There may be many channels, but you need to pick the channel name of hanged call only ...
This is sample output - yours may be different.
0

soft hangup Zap/1-1

coolsanjiv · 2012-10-31 06:50:18 3
Suspend to RAM with KDE 4

%qdbus org.freedesktop.PowerManagement /org/kde/Solid/PowerManagement suspendToRam Service 'org.freedesktop.PowerManagement' does not exist.
This is sample output - yours may be different.
0

dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend

unixmonkey45062 · 2013-01-03 21:35:19 6
launch bash without using any letters

Starts a new shell (in bash/sh, it starts bash/sh). 'man bash' explains: "If arguments remain after option processing, and neither the -c nor the -s option has been supplied, the first argument is assumed to be the name of a file containing shell commands. If bash is invoked in this fashion, $0 is set to the name of the file, and the positional parameters are set to the remaining arguments."
This is sample output - yours may be different.
0

$0

fhtagn · 2013-03-05 22:57:14 4
Display terminal command history with date

If the HISTTIMEFORMAT is set, the time stamp information associated with each history entry is written to the history file, marked with the history comment character. Show Sample Output
This is sample output - yours may be different.
```
    2  19/09/13 11:21:02 ./adb kill-server
    3  19/09/13 11:21:02 ./adb start-server
    4  19/09/13 11:21:02 ./adb 
    5  19/09/13 11:21:02 ./adb shell
    6  19/09/13 11:21:02 ./adb shell
    7  19/09/13 11:21:02 cd /Users/weng/Software/android-sdk-macosx/platform-tools/
    8  19/09/13 11:21:02 ./adb kill-server
    9  19/09/13 11:21:02 ./adb start-server
   10  19/09/13 11:21:02 ping 192.168.1.10
```
0

echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bash_profile

99RedBalloons · 2013-09-19 03:25:14 13
truncate deleted files from lsof

Be careful, first run: lsof | grep -i deleted | grep REG | grep -v txt Then, give it the boot!
This is sample output - yours may be different.
0

lsof | grep -i deleted | grep REG | grep -v txt | ruby -r 'pp' -e 'STDIN.each do |v| a = v.split(/ +/); puts `:> /proc/#{a[1]}/fd/#{a[3].chop}`; end'

jim80net · 2014-03-11 06:02:09 7
Show an alphabetized list of all mcollective nodes
This is sample output - yours may be different.
0

mco ping | head -n -4 | awk '{print $1}' | sort

mrwulf · 2014-06-24 18:20:16 7
Sync local machine date to remote machine over ssh

This will take the local machines date and set it on the remote machine. This really only works right if you have already swapped an ssh key. Show Sample Output
This is sample output - yours may be different.
```
Fri Jan 30 09:32:13 EST 2015
```
0

ssh root@host.domain.tld "date -s '"$(date)"'";

MelonSmasher · 2015-01-30 14:40:33 10
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pretend to be busy in office to enjoy a cup of coffee

using seq inside a subshell instead of a bash sequence to create increments.

Capture video of a linux desktop

Alert visually until any key is pressed

I learned a few things reading this command. But I did run into a few issues: 1. On systems that don't use GNU echo (e.g. macOS 10.14.5 Mojave), the e option may not be supported. In this case ANSI escape codes will echoed as text and the terminal will not flash, like this: \e[?5h\e[38;5;1m A L E R T Thu Jun 20 16:31:29 PDT 2019 2. Since the read command strips\ignores leading backslashes, if a user types the backslash character once in the loop, it will not break. Typing backslash twice in a loop will break as expected. 3. The foreground color is set to red (\e[38;5;1m) on every loop. This could be set once before we call while, and then reset once when the loop breaks. 4. Instead of resetting the foreground color when it breaks, the video mode is set back to normal (\e[?5l). This has the effect of leaving the terminal text red until it is manually reset. The alternative I'm proposing here addresses these issues. I tested it on macOS and Arch Linux.

Delete an IPtable rules based on row number

Server load and process monitoring

In certain cases you mighy need to monitor the server load caused by certain process. For example HTTP, while stress testing apache using ab (apache benchmark) you may want to monitor the server status,load, # of spawned HTTP processes, # of established connections, # of connections in close wait state, apache memory footprint etc.

list files recursively by size

Using NMAP to check if a port is open or close

Using NMAP to check to see if port 22(SSH) is open on servers and network devices.

Install pip with Proxy

Installs pip packages defining a proxy

Check which files are opened by Firefox then sort by largest size.

Just refining last proposal for this check, showing awk power to make more complex math (instead /1024/1024, 2^20). We don't need declare variable before run lsof, because $(command) returns his output. Also, awk can perform filtering by regexp instead to call grep. I changed the 0.0000xxxx messy output, with a more readable form purging all fractional numbers and files less than 1 MB.

Print text string vertically, one character per line.

Define a function $ vert () { echo $1 | grep -o '.'; } Use it to print some column headers $ paste

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