This allows you to jump from one location in the directory tree directly to another. The first example moves you to the system binaries directory. The third example moves you to your home directory, where you can store your own files. In the first example, we moved into the sys subdirectory of the current directory. Yes, you too can create your very own custom directories.
Any character can be part of the name, and the names can be as long as desired.
The first example renames myfile-old so it is now named myfile.old . While viewing the file, the basic commands are space to see the next page, q to quit, return to see one more line, and b to go back a page. Executing Files Executable programs are just like any other file in Unix. You can mv, cp, or even cat them. Sometimes you may run into a program that will not quit, or is stuck in an endless loop, and is tying up the shell.