$ curl cheat.sh/
# ssh-agent
# Spawn an SSH Agent process.
# An SSH Agent holds SSH keys decrypted in memory until removed or the process is killed.
# See also `ssh-add`, which can add and manage keys held by an SSH Agent.
# More information: <https://man.openbsd.org/ssh-agent>.

# Start an SSH Agent for the current shell:
eval $(ssh-agent)

# Kill the currently running agent:
ssh-agent -k

$
Follow @igor_chubin cheat.sh tldr