$ curl cheat.sh/

# 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/yes>.

# Repeatedly output "message":
yes message

# Repeatedly output "y":
yes

# Accept everything prompted by the `apt-get` command:
yes | sudo apt-get install program

$

Follow @igor_chubin cheat.sh tldr