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Date: Mon, 24 Mar 2014 19:02:13 +0100
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Subject: Advanced Bash-Scripting Guide script result different with it on the linux
From: shu <shu DOT eclipse AT gmail DOT com>
To: cygwin AT cygwin DOT com
Content-Type: text/plain; charset=UTF-8
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 A script  in Advanced Bash-Scripting Guide (at the bottom of
http://www.tldp.org/LDP/abs/html/ioredirintro.html )

Even i had change "sleep 1" -->"sleep 3" , still different.
Come out result:
2nd, to stderr
FD4: FIFO2: 3rd, to fd 3
FD6: FIFO2: 3rd, to fd 3
FD5: FIFO2: 3rd, to fd 3
FIFO1: FIFO2: 3rd, to fd 3
FD4: 4th, to fd 4
FD5: 5th, to fd 5
FD5: PIPE: 6th, through a pipe, to fd 5
FD6: 7th, to fd 6
FIFO1: 8th, to fd 7
FIFO1: FD8: 9th, to fd 8, to fd7


While linux result is:
1st, to stdout
2nd, to stderr
FIFO2: 3rd, to fd 3
FD4: FIFO2: 3rd, to fd 3
FIFO1: FIFO2: 3rd, to fd 3
FD5: FIFO2: 3rd, to fd 3
FD6: FIFO2: 3rd, to fd 3
FD4: 4th, to fd 4
FD5: 5th, to fd 5
FD5: PIPE: 6th, through a pipe, to fd 5
FD6: 7th, to fd 6
FIFO1: 8th, to fd 7
FIFO1: FD8: 9th, to fd 8, to fd7



#! /usr/bin/env bash

mkfifo /tmp/fifo1 /tmp/fifo2
while read a; do echo "FIFO1: $a"; done < /tmp/fifo1 & exec 7> /tmp/fifo1
exec 8> >(while read a; do echo "FD8: $a, to fd7"; done >&7)

exec 3>&1
(
 (
  (
   while read a; do echo "FIFO2: $a"; done < /tmp/fifo2 | tee /dev/stderr \
   | tee /dev/fd/4 | tee /dev/fd/5 | tee /dev/fd/6 >&7 & exec 3> /tmp/fifo2

   echo 1st, to stdout
   sleep 1
   echo 2nd, to stderr >&2
   sleep 1
   echo 3rd, to fd 3 >&3
   sleep 1
   echo 4th, to fd 4 >&4
   sleep 1
   echo 5th, to fd 5 >&5
   sleep 1
   echo 6th, through a pipe | sed 's/.*/PIPE: &, to fd 5/' >&5
   sleep 1
   echo 7th, to fd 6 >&6
   sleep 1
   echo 8th, to fd 7 >&7
   sleep 1
   echo 9th, to fd 8 >&8

  ) 4>&1 >&3 3>&- | while read a; do echo "FD4: $a"; done 1>&3 5>&- 6>&-
 ) 5>&1 >&3 | while read a; do echo "FD5: $a"; done 1>&3 6>&-
) 6>&1 >&3 | while read a; do echo "FD6: $a"; done 3>&-

rm -f /tmp/fifo1 /tmp/fifo2


# For each command and subshell, figure out which fd points to what.
# Good luck!

exit 0

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