SlackBuildsOrg/network/acme.sh

An ACME Shell script

 - An ACME protocol client written purely in Shell (Unix shell)
   language.
 - Full ACME protocol implementation.
 - Support ACME v1 and ACME v2
 - Support ACME v2 wildcard certs
 - Simple, powerful and very easy to use. You only need 3 minutes to
   learn it.
 - Bash, dash and sh compatible.
 - Simplest shell script for Let's Encrypt free certificate client.
 - Purely written in Shell with no dependencies on python or the
   official Let's Encrypt client.
 - Just one script to issue, renew and install your certificates
   automatically.
 - DOES NOT require root/sudoer access.
 - Docker friendly
 - IPv6 support
 - Cron job notifications for renewal or error etc.

 Optional dependencies:

* socat - to standalone mode