whatis - display one-line manual page descriptions.
Display a brief information about a command:
whatis ls
Display a long version information about a command:
whatis -l lspgpot
Display specific sections of man pages:
whatis -s "8" ifconfig
Display information using wild-cards:
whatis -w "ls*"
Display information using regular expressions:
whatis -r "^ls"
Display a help message and exit:
whatis --help
Display a short usage message and exit:
whatis --usage
Display version information:
whatis -V