whatis searches the database for brief descriptions of command-line programs

whatis command Syntax

$ whatis keyword

whatis command examples

 $ whatis ls
git-ls-files(1)          - Show information about files in the index and the working tree
git-ls-remote(1)         - List references in a remote repository
git-ls-tree(1)           - List the contents of a tree object
git-mktree(1)            - Build a tree-object from ls-tree formatted text
npm-ls(1)                - List installed packages
npm-ls(3)                - List installed packages
ls(1)                    - list directory contents
$ whatis top
top(1)                   - display and update sorted information about processes