This document discusses Linux/Unix standard input, output, and error streams known as STDIN, STDOUT, and STDERR. It explains that STDIN is stream 0 for program input, STDOUT is stream 1 for normal program output, and STDERR is stream 2 for error output. The document also provides examples of common Linux/Unix commands like cat, head, tail, more, less, cut, wc, uniq, sort, and grep that use STDIN and STDOUT and describes basic redirection using > and 2>.

1. Linux/Unix &
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2010, Spring

2. • 0- - STDIN
• 1- - STDOUT
• 2- - STDERR

3. STDIN#0
Program
STDOUT#1 STDERR#2

4. STDOUT
STDERR
STDOUT=
STDERR=

5. Redirection
• 1>
• 2>
•< STDIN(input)

6. • nl-
• cat tac- STDIN STDOUT
• head tail-
• more less-
• cut-
• wc-
• uniq-
• sort-
• grep-