Data Streams

  • Standard Input (stdin) — programs accept keyboard input via standard input, or ‘stdin’
  • Standard Output (stdout) — text mode programs send most data to users via standard output, or ‘stdout’
  • Standard Error (stderr) — Linux provides a second type of output called standard error, or ‘stderr’
    • stderr is intended to carry high-priority info such as error messages
    • stderr can be redirected independently of the other streams
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