Redirection

General

• 0 = stdin
• 1 = stdout
• 2 = stderr
• Each of these can be redirected independently
• To redirect stderr, preface the > with the number of the file descriptor to redirect> This is often used to discard error info from appearing on the screen
  • since stderr is on file descriptor 2, use 2>
• Redirect stdout and stderr to different files
  • kill iHUP 1234 >killout.txt 2>killerr.txt
  • I am guessing that 1 is the default so you don't see 1>
• Redirect stdout and stderr to the same file
  • kill -1 1234 >blah.txt 2>&1
    • Read it like this: redirect stdout to the file blah.txt, then direct stderr to the same place as stdout
• Redirect all output, stdout and stderr, to /dev/null
  • kill -1 1234 >/dev/null 2>&1
• Redirecting input is kind of lame
  • more < blah.txt
    • why not just do more blah.txt