• 5.1. Simple redirections
  • 5.1.1. What are standard input and standard output?
  • 5.1.2. The redirection operators
• 5.2. Advanced redirection features
  • 5.2.1. Use of file descriptors
  • 5.2.2. Examples
• 5.3. Filters
  • 5.3.1. More about grep
  • 5.3.2. Filtering output
• 5.4. Summary
• 5.5. Exercises

This chapter describes more about the powerful UNIX mechanism of redirecting input, output and errors. Topics include:

• Standard input, output and errors
• Redirection operators
• How to use output of one command as input for another
• How to put output of a command in a file for later referrence
• How to append output of multiple commands to a file
• Input redirection
• Handling standard error messages
• Combining redirection of input, output and error streams
• Output filters

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