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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Find size in kilobyte of files that are deleted but still in use and therefore consumes diskspace

Runs previous command replacing foo by bar every time that foo appears
To replace foo by bar, but not execute, do ^foo^bar^:p To replace all foo by bar, but not execute, do ^foo^bar^:&:p

Open a file at the specified line
You may also use +line:column syntax.

what model of computer I'm using?

Backup a file with a date-time stamp
Appends the input file with the date format YYYY-MM-DD.bak. Also runs silently if you remove the -v on the cp at the end of the function.

Short and elegant way to backup a single file before you change it.
Remember to backup everything before changing it so you can restore all to normal.

Create a backdoor on a machine to allow remote connection to bash
This will launch a listener on the machine that will wait for a connection on port 1234. When you connect from a remote machine with something like : nc 192.168.0.1 1234 You will have console access to the machine through bash.

Make changes in .bashrc immediately available

Create new user with home dir and given password
The crypt function takes a password, key, as a string, and a salt character array which is described below, and returns a printable ASCII string which starts with another salt. It is believed that, given the output of the function, the best way to find a key that will produce that output is to guess values of key until the original value of key is found. from http://en.wikipedia.org/wiki/Crypt_(Unix)


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