1 2T=$(mktemp -d ${TMPDIR:-/tmp}/sh-test.XXXXXX) 3trap 'rm -rf $T' 0 4cd $T || exit 3 5mkfifo fifo1 6 7v=$( 8 exec 3>&1 9 : <fifo1 & 10 { 11 wait $! 12 trap 'trap "" PIPE; echo trapped >&3 2>/dev/null' PIPE 13 echo x 2>/dev/null 14 } >fifo1 15) 16test "$v" = trapped 17