A Basic UNIX Tutorial - download pdf or read online

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By Byrd J.

This educational includes fourteen sections, every one of which addresses a primary point of UNIX computing. It concentrates on illustrating the valuable innovations by means of supplying brief causes, besides examples, and workouts.

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The login program The login program receives the username from getty, and prompts you for your password. Login then consults the system database /etc/passwd to verify your password. (Note that login will request your password even if there is no entry in /etc/passwd for the username you've given. ) Login turns off terminal echo so that your password is not displayed on the screen. Having verified your password, login then uses information in /etc/passwd to invoke your default shell. If no default shell is specified in the /etc/passwd entry, login starts the Bourne shell (/bin/sh).

Quitting emacs To exit emacs and return to the Unix shell, type Control-X-Control-C. If you have made changes to the buffer since the last time you saved it to disk, emacs will ask you if you want to save. Type y for yes, or n for no. Getting help Emacs has an on-line help system that can be invoked by typing Control-H. ), emacs will present a list of help topics you can choose. The emacs display The display in emacs is divided into three basic areas. The top area is called the text window. The text window takes up most of the screen, and is where the document being edited appears.

The 'printers' program changes the line that # sets default printer queue in this file, and this file gets "run" again # to load the new value into the user environment. # The command 'more' is altered to call the more capable 'less' pager. Disable # this alias if you want to use the 'more' pager. # The command 'ls' is set up to identify executable # files with an * and directories with a /. e. without the * and /. # The command 'edit' is set up to call default editor (see EDITOR=... above). # The command 'oldmenu' brings up the old cwis menus.

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A Basic UNIX Tutorial by Byrd J.

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