What does the certbot command line option -w do?

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It's an alias to --webroot-path according to User Guide — Certbot 2.7.0.dev0 documentation :

If you’re running a local webserver for which you have the ability to modify the content being served, and you’d prefer not to stop the webserver during the certificate issuance process, you can use the webroot plugin to obtain a certificate by including certonly and --webroot on the command line. In addition, you’ll need to specify --webroot-path or -w with the top-level directory (“web root”) containing the files served by your webserver. For example, --webroot-path /var/www/html or --webroot-path /usr/share/nginx/html are two common webroot paths.

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