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How to remove an ISO image from media database

live ssh network throughput test
connects to host via ssh and displays the live transfer speed, directing all transferred data to /dev/null needs pv installed Debian: 'apt-get install pv' Fedora: 'yum install pv' (may need the 'extras' repository enabled)

Connect to SMTP server using STARTTLS
Allows you to connect to an SMTP server over TLS, which is useful for debugging SMTP sessions. (Much like telnet to 25/tcp). Once connected you can manually issue SMTP commands in the clear (e.g. EHLO)

list block devices
Shows all block devices in a tree with descruptions of what they are.

Search for files older than 30 days in a directory and list only their names not the full path

a function to find the fastest free DNS server
Uses GNU Parallel.

Find all files that have nasty names
Get a list of file names that may cause problems (eg being served on a webserver, typing a URL on a mobile, etc)

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

Bash scripts encryption and passphrase-protection
This function will encrypt a bash script and will only execute it after providing the passphrase. Requires mcrypt to be installed on the system.


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