system("foo --bar baz") == 0
  or die "foo failed.\n";

chdir 'foobar' or die "Couldn't chdir to foobar. $!\n";

system("foo --bar baz2") == 0
  or die "Couldn't pull it off.\n";

system("foo2 --bar baz") == 0
  or die "No joy. foo2 had problems.\n";

chdir '..' or die "Couldn't go back up to base dir. $!\n";

system("bar --foo baz") == 0
  or die "Darn. bar didn't make it.\n";