1 2failures= 3failure() { 4 echo "Error at line $1" >&2 5 failures=x$failures 6} 7 8( 9 exec >/dev/null 10 echo bad 11) 12[ $? = 0 ] || failure $LINENO 13( 14 exec ${SH} -c 'exit 42' 15 echo bad 16) 17[ $? = 42 ] || failure $LINENO 18( 19 exec /var/empty/nosuch 20 echo bad 21) 2>/dev/null 22[ $? = 127 ] || failure $LINENO 23 24test -z "$failures" 25