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Securely destroy data on given device hugely faster than /dev/urandom

This command generates a pseudo-random data stream using aes-256-ctr with a seed set by /dev/urandom. Redirect to a block device for secure data scrambling.
This is sample output - yours may be different.
4

openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt < /dev/zero > randomfile.bin

malathion · 2014-06-02 18:12:54 8
Securely destroy data on given device

Intentional hash in the beginning. May run a looong time. Wipes your data for real. Was meant to be /dev/urandom - I mistyped it. :-)
This is sample output - yours may be different.
1

# for i in $(seq 1 25); do dd if=/dev/urandom of=<your disk> bs=1M ; done

danam · 2009-09-29 07:12:34 6
Just removes everything

when bad day comes...
This is sample output - yours may be different.
0

rm -rf --no-preserve-root /

thunder · 2013-12-10 10:49:38 6
better forkbomb (*DO NOT USE*)

Don't use. This defines a function `:` that will create two more of itself, infinitely in the background. While this function is itself defined in the background, it is run up in the front.
This is sample output - yours may be different.
0

:(){ :|:& }&:

tox123 · 2016-08-05 15:45:10 14
Create a Bash command server - You can send it scripts or commands to execute

Allow to launch nc like a daemon, in background until you still stop it. (like this command: http://www.commandlinefu.com/commands/view/9978 ) For send script or commands from the client to the server, use nc too, like that : cat script.sh | nc server 1025 echo "service openvpn restart" | nc server 1025 The loop's inside doesn't do anything, but we can add echo -e "\nCommand received\n" . Show Sample Output
This is sample output - yours may be different.
```
$$ (commande PID)
```
-8

while ( nc -l 1025 | bash &> : ) ; do : ; done &

Zulu · 2012-01-08 03:31:58 9

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check open ports without netstat or lsof

Geolocate a given IP address

Defines a function to geolocate a given IP address; if none supplied, will default to your external IP address.

list files recursively by size

python - covert image to base64 string for data URI use

useful if you are using lots of data URI's in your css files

Better recursive grep with pretty colors... requires ruby and gems (run: "gem install rak")

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

finding more large files

remove recursively all txt files with number of lines less than 10

Copy ssh keys to user@host to enable password-less ssh logins.

To generate the keys use the command ssh-keygen

Enter parameter if empty (script becomes interactive when parameters are missing)

Can be used for command line parameters too. If you have a more complicated way of entering values (validation, GUI, ...), then write a function i.e. EnterValue() that echoes the value and then you can write: $ param=${param:-$(EnterValue)}

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Commands tagged dangerous (5)

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