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$ whatis man

man - find and display reference manual pages

Examples:

1. man man
2. man systemctl
3. man systemd
4. man ufw
5. man curl
6. man wget
7. man -k ext4
8. man -k xfs
9. man -k bfs
10. man xfs
11. man banner

Please click on "man man " to see the Manual Page for this command.