By itself, cd will do nothing. When it is followed by the name or path of a folder, for example cd /home/user, it will change the current working directory to the one specified.
It is not a command. It is an option for a command. Depending on the command it can modify the actions taken. For cp, mv and rm it makes the command interactive (are you sure). For ls it shows the...
The "which" command returns the absolute path of the executable that is called when a command is issued. For instance, 'which firefox'. This is useful in determining whether you are using a locally...
Most of the basic command-line utilities have the same name and perform the same task. However, the command switches may be very different. You should always read the man page of any utility that you...
That would be a semi-contradiction; the command line would need to be already running in order to enter a command. The name of the program that actually provides the command line is called a shell....
It's probably the only thing that came to mind. Do you have a better idea? I'm sure we could brainstorm loads of them. If this is what you wanted, though, cd stands for change directory.