Chapter 3

Regular expression and Pipe

In order to understand UNIX based OS, it is important to have knowledge about this regular expression and pipe. Regular expressions are used in various UNIX operations. Pipe may be the most characteristic concept in UNIX. Please understand them clearly.

Contents of this Chapter

3.1 Standard I/O
3.2 Redirection
3.2.1 Redirect output
3.2.2 Create a file by cat command
3.3 Standard error
3.4 Pipe
3.5 grep command
3.5.1grep command
3.5.2matching with the standard output
3.6 Exercise
3.7 The chapter test

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