Software in UNIX/Linux is managed in packages. Packages are collections of tools that UNIX users can install on their account. To list, add, or remove packages, type `addpkg` in a terminal.

NOTE: You must completely log out and back in for the changes to take effect.

In order to add a new package, you must select it from the list. The currently selected program or button is highlighted in dark blue. Move up and down the list with the ‘up’ and ‘down’ arrow keys, and select a program with the space bar. Currently installed and/or selected packages have an X next to them. Press ‘Tab’ or go all the way down the list until you get OK button highlighted and press Enter to save the changes. Press Enter again to exit addpkg.

To remove a package, you must deselect it from the list. Move down to the program and press the space bar again to remove the ‘X’ from beside it. Press ‘Tab’ or go all the way down the list until you get OK button highlighted and press Enter to save the changes. Press Enter again to exit addpkg.

NOTE: After you use the addpkg command, before you can use the package, you must completely log out. That is, you must get to the point where you initially entered your login name and password. Then simply log back in.