mdBook/book-example/src/cli/watch.md

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The watch command

The watch command is useful when you want your book to be rendered on every file change. You could issue mdbook build everytime you change a file. But using mdbook watch once will watch your files and will trigger a build whenever you modify a file.

Specify a directory

Like init and build, watch can take a directory as argument to use instead of the current working directory.

mdbook watch path/to/book