There are 2 correct and portable ways to achieve what you want.
Good old shell syntax:
while [ "$guess" != 5 ] && [ "$guess" != 10 ]; do
And bash syntax (as you specify):
while [[ "$guess" != 5 && "$guess" != 10 ]]; do
There are 2 correct and portable ways to achieve what you want.
Good old shell syntax:
while [ "$guess" != 5 ] && [ "$guess" != 10 ]; do
And bash syntax (as you specify):
while [[ "$guess" != 5 && "$guess" != 10 ]]; do