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 -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
