This is really easy on Linux, maybe even more that in Windows, you can use CRL+C and CTRL+V as in Windows, but the easy way is.

Select the text you want to copy, then go to the application where to want to paste it, and using the middle button of your mouse (the wheel in some models) you paste it.

If you want to play protected CDs or DVDs on Arch Linux or any other distro, you may need to install libdvdcss, in order to avoid the message "Media stream scrambled/encrypted".

In Arch just enter this at the prompt.

sudo pacman -S libdvdcss

You may know that if you have a directory called

My-Documents

and you want to change to it, you have to do something like this

cd My-[TAB]

And you will end with the full command like this.

cd My-Documents

But, if you do this

cd my-[TAB]

According to Wikipedia:

An ISO image is an archive file (also known as a disk image) of an optical disc in a format defined by the International Organization for Standardization (ISO). This format is supported by many software vendors. ISO image files typically have a file extension of .ISO but Mac OS X ISO images often have the extension .CDR. The name ISO is taken from the ISO 9660 file system used with CD-ROM media, but an ISO image can also contain UDF file system because UDF is backward-compatible with ISO 9660.

If you need to install or update an Arch Linux package and you are behing a proxy, there is a way to quickly configure it to use that proxy.

This will not be permanent, so it is great to use with Laptops, to set a momentary proxy server.

To set the http proxy enter in the console

su -

last is another command for the system admin tool box, it displays the login history of all or any specific user.

Yo do not need to be root to use it:

last

For Desktop computers, this is usually needless, as you may be the only user logged in at an any given time, but if you are a server admin, you know that there may be a lot of users connected to the Server at a given time.

It is useful to know who they are, and maybe also, what are they doing, this for security reasons, but also if you are planning any server maintenance or reboot, you will have to know who are logged, and what are they doing to know if you can reboot the server in that moment, or have to wait.

There are a lot of wireless manager software available for Linux, some of the most common ones are:

NetworkManager, which is the default for Ubuntu
KwifiManager, which is the KDE's default one

I used to use wifi-radar, but now I am using wicd.