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Introduction to Unix

CHAPTER 6 Special Unix Features

One of the most important contributions Unix has made to Operating Systems is the provision of many utilities for doing common tasks or obtaining desired information. Another is the standard way in which data is stored and transmitted in Unix systems. This allows data to be transmitted to a file, the terminal screen, or a program, or from a file, the keyboard, or a program; always in a uniform manner. The standardized handling of data supports two important features of Unix utilities: I/O redirection and piping.

With output redirection, the output of a command is redirected to a file rather than to the terminal screen. With input redirection, the input to a command is given via a file rather than the keyboard. Other tricks are possible with input and output redirection as well, as you will see. With piping, the output of a command can be used as input (piped) to a subsequent command. In this chapter we discuss many of the features and utilities available to Unix users.

6.1 - File Descriptors
6.2 - File Redirection
6.3 - Other Special Command Symbols
6.4 - Wild Cards

Introduction to Unix - 14 AUG 1996
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