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# tests of ksh93-like dup-and-close redirection operators exec 9<$0 f() { exec 5<$0 exec 0<&5- while read line; do echo "$line" done } f typeset -f f # make sure it was closed read -u 5 foo 2>&1 | grep -q 'invalid file descriptor' echo after read exec 5<&0 exec <&- read abcde 2>&1 | grep -q 'read error' exec 0<&9- read line echo $line