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system beep off

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

Cleanup firefox's database.

Revert all modified files in an SVN repo

remove lines which are longer than 255

Print unique ipaddresses as they come in from Apache Access Log File
Prints the unique IP Addresses as they arrive from an Apache `access.log` file. The '-W interactive' tells awk to start writing to stdout immediately and not buffer the output. This command builds on the uniq lines without sorting command (http://www.commandlinefu.com/commands/view/4389/remove-duplicate-entries-in-a-file-without-sorting.)

Check SATA link speed.
Check SATA controller type. 6.0 Gbps - SATA III 3.0 Gbps - SATA II 1.5 Gbps - SATA I

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

Remove color codes (special characters) with sed
Removes ANSI color and end of line codes to the [{attr1};...;{attrn}m format.

check open ports without netstat or lsof


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