Linux

2. source licenses that do not contain copyleft provisions and therefore are more permissive in how they allow software to be redistributed.
3. A philosophy held by the Free Software Foundation (FSF) that someone who modifies free software should be required to share any changes they have made.
6. used to view manual (man) pages for commands.
10. that determines information about command type.
12. most commonly used shell for Linux distributions.
13. that turns a local variable into an environment variable.

1. that outputs a list of previously executed commands.
4. used to find any file or directory. Relies on a database typically generated nightly.
5. containing a list that defines which directories the shell looks in for commands.
7. environment or device in which the user interacts with the software. It can also refer to a graphical program which emulates a console.
8. that displays output in the terminal.
9. used to view info documentation for commands.
11. open source license which states that you may redistribute the source software and binaries as long as copyright notices are maintained and there is no implication that the original creator endorses your version. Short for Berkley Software Distribution.