Open a terminal (I use the short-cut keys: Ctrl + Alt + T) and type (without the quotes): "man usermod". This will reveal the manual page for usermod. Basically, usermod is used to modify a user account
Ubuntu has a command interface, Its called a terminal
format c: does the job!
bash is located in /bin/bash.
Yes, but it also has a command line.
ifconfig
1. For ubuntu the command is lpq 2. For redhat the command is lpstat
Both, all versions have a command line, and every version but minimal and server have a gui
Yes. You can use the 'nice' command to lower the priority of a process.
There is a GUI tool that you can use, or try the 'passwd' command in a terminal window.
Ubuntu: system-config-printer brings up a GUI printer configuration
Almost all Unix/Linux systems use the 'df' command to find out how big the partition is, how much is in use, and the percentage of the system in use. This command must be used in a command window.
Xubuntu and Ubuntu are two different versions of Ubuntu. (Ubuntu has GNOME.)