Исправление Morin, (текущая версия) :
RTFM https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html
An AND list has the form
command1 && command2
command2 is executed if, and only if, command1 returns an exit status of zero (success).
Исходная версия Morin, :
RTFM https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html
''' An AND list has the form
command1 && command2
command2 is executed if, and only if, command1 returns an exit status of zero (success). '''