This section introduces some of the most useful basic commands on a UNIX system, including those covered in the last section.
Note that options usually begin with a `` -'', and in most cases multiple one-letter options may be combined using a single `` -''. For example, instead of using the command ls -l -F, it is adequate to use ls -lF.
Instead of listing all of the options available for each of these commands, we'll only talk about those which are useful or important at this time. In fact, most of these commands have a large number of options (most of which you'll never use). You can use man to see the manual pages for each command, which list all of the available options.
Also note that many of these commands take a list of files or directories as arguments, denoted by ``file1 ... fileN''. For example, the cp command takes as arguments a list of files to copy, followed by the destination file or directory. When copying more than one file, the destination must be a directory.
