&{
    bg exe sub { "2>#" }, qw( ls  /tmp  does_not_exist ),
       exe "tac",
       exe sub { print "2nd cmd: @_\n"; print "three> $_" while <STDIN> },
    bg exe "sort",
       exe qw(cat -n),
       exe sub { print "six> $_" while <STDIN>; print "5th cmd: @_\n" },
};