Download A Basic UNIX Tutorial by Byrd J. PDF

By Byrd J.

This educational includes fourteen sections, each one of which addresses a primary point of UNIX computing. It concentrates on illustrating the significant techniques by means of offering brief factors, besides examples, and workouts.

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A Basic UNIX Tutorial

This instructional includes fourteen sections, every one of which addresses a primary element of UNIX computing. It concentrates on illustrating the vital strategies via offering brief reasons, in addition to examples, and workouts.

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When you issue the cd command with no directory argument, you will be placed in the directory defined in the HOME environment variable. The HOME variable is also where the shell will look for the user login scripts. MAIL The MAIL variable contains the name of the directory where your incoming mail is stored. When you start a mail program, the program will look in the directory stored in the MAIL environment variable for your incoming mail messages. EDITOR The EDITOR variable is used by programs that must invoke a text editor to provide the ability to edit or compose documents.

Because Unix treats such devices as files, a degree of compatibility can be achieved between device i/o, and ordinary file i/o, allowing for the more efficient use of software. Special files can be either character special files, that deal with streams of characters, or block special files, that operate on larger blocks of data. Typical block sizes are 512 bytes, 1024 bytes, and 2048 bytes. Links A link is a pointer to another file. Remember that a directory is nothing more than a list of the names and i-numbers of files.

There is only one kill buffer in emacs, which means that you can cut text from one document, and paste it into another. To define a region of text, place the cursor at one end of the region and press Control-spacebar. That sets the mark. Then, move the cursor to the other end of the region. The text between the mark and the cursor defines the region. To cut a region of text, and place it in the kill buffer, use the command Control-W (think of Wipe). The paste command is Control-Y. It Yanks the block of text from the kill buffer, and places it where the cursor rests.

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