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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"

Remove old kernel packages

Get Dell Service Tag Number from a Dell Machine
This will give you the Dell Service tag number associated with your machine. Incredibly useful when you need that number for tech support or downloads.

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Disable beep sound from your computer
This command will disable the beep sound from the PC speaker.

MySQL dump restore with progress bar and ETA
Display a progress bar while restoring a MySQL dump.

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

Download all manuals RedHat 7 (CentOS/Fedora) with one command in Linux

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)

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)


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