portability

Signed-off-by: Mattias Andrée <maandree@operamail.com>
portability

Signed-off-by: Mattias Andrée <maandree@operamail.com>
update readme to reflect than using dash instead of bash will reduce the memory usage to below agetty

Signed-off-by: Mattias Andrée <maandree@operamail.com>