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remove hostname from known_hosts

Sharing file through http 80 port
From the other machine open a web navigator and go to ip from the machine who launch netcat, http://ip-address/ If you have some web server listening at 80 port then you would need stop them or select another port before launch net cat ;-) * You need netcat tool installed

list files recursively by size

Optimal way of deleting huge numbers of files

move you up one directory quickly
Alias a single character 'b' to move to parent directory. Put it into your .bashrc or .profile file. Using "cd .." is one of the most repetitive sequence of characters you'll in the command line. Bring it down to two keys 'b' and 'enter'. It stands for "back" Also useful to have multiple: alias b='cd ../' alias bb='cd ../../' alias bbb='cd ../../../' alias bbbb='cd ../../../../'

create random string from /dev/urandom (or another length)

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

generate a random 10 character password
Generate a table of random 10 character passwords

Rename files in batch

monitor my process group tree


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