I/O Redirection (6.2)

• stdin (fd=0), stdout (fd=1), stderr (fd=2)

• Redirection examples: ( <, >, >>, >&, >!, >&! )

  fmt
  
  fmt < personal_letter
  fmt > new_file
  fmt < personal_letter > new_file
  fmt >> personal letter
  fmt < personal_letter >& new_file
  fmt >! new_file
  fmt >&! new_file

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