Let’s say you’re looking for more information about a command like ansible. You can use man ansible to print the man page for the ansible command. But maybe you want to see a list of man pages that mention the string “ansible”. You can simply write:

> man -k ansible

ansible(1)               - run a task on a target host(s)
ansible-doc(1)           - show documentation on Ansible modules
ansible-galaxy(1)        - manage roles using galaxy.ansible.com
ansible-playbook(1)      - run an ansible playbook
ansible-pull(1)          - pull playbooks from VCS server and run them using this machine as the target
ansible-vault(1)         - manage encrypted ansible vars files (YAML)

The number next to each man entry represents its section number. Thanks Justin Weissig for helping me learn this useful tip.