Unix Unleashed by Marla Abraham

By Marla Abraham

Working procedure, together with all of its utilities; counsel, methods, and examples; shell scripts; and extra.

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You can even run cat without specifying an input or output file: $ cat Let us go then, you and I, Let us go then, you and I, When the evening is spread out against the sky When the evening is spread out against the sky Press Ctrl+D to insert an end-of-file. The cat command echos to your screen every line that you enter before Ctrl+D because, by default, cat uses your terminal keyboard as its input file and your screen as its output file. Like other UNIX commands, cat treats files quite consistently and therefore is very flexible.

After you have thought about what you want your password to be, you can change it with the passwd command. Try it now; you can change your password as often as you like. Enter passwd. First, a prompt asking you to enter your old password is displayed. Type your old password and press Return. Next, you are prompted for your new password. Type it in and press Enter. Finally, you are prompted to re-enter your new password. This confirmation helps avoid changing your password if you made a typing error.

In this chapter, you learn how to create and remove files, copy and rename them, create links to them, and use directories to organize your files so that you can find them later. You also learn how to view your files, list their names and sizes, and move around in the UNIX file tree. Finally, this chapter shows how you can choose to share or restrict the information in your files. One of UNIX's greatest strengths is the consistent way in which it treats files. Although some operating systems use different types of files that each require unique handling, you can handle most UNIX files the same.

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