yes

Output something repeatedly. This command is commonly used to answer yes to every prompt by install commands (such as apt-get). More information: https://www.gnu.org/software/coreutils/manual/html_node/yes-invocation.html.

• Repeatedly output "message":

yes message

• Repeatedly output "y":

yes

• Accept everything prompted by the apt-get command:

yes | sudo apt-get install program

• Repeatedly output a newline to always accept the default option of a prompt:

yes ''