1 If your wooden pallets contain low-grade engineered wood or cardboard, they may also contain formaldehyde and harbor all kinds of critters you don't want to know about.
Command shell overview. The command shell is a separate software program that provides direct communication between the user and the operating system. The non-graphical command shell user interface provides the environment in which you run character-based applications and utilities.
1 One of these tools is something called shell programming. This means writing code that a command shell executes. 2  There is something like this under Windows, but as usual, the Windows version is a weak imitation.  The most common Linux shell is named Bash.