This article assumes a certain comfort with the Linux command line--it's not mentioned but important. Some parts will be confusing without this comfort or understanding.

Contents within backticks (i.e. "", you're missing these when you pasted the command) tell the shell to execute these commands.uname -r` prints the running kernel's running release, and pwd prints the current directory. Both uname and pwd are standard UNIX commands and have man pages where you can read more information about them.