Created
May 18, 2024 16:17
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#!/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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