Change file name on creation

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Thanks. What kind of script do I need to google/reseach to do the following?

  1. renew certificate as root
  2. change file names/link files to /var/lib/3cxpbx/Bin/nginx/conf/Instance1
  3. renew every two/three months

Also does certbot take up a lot of resources? gathering that it is running on a 3CX phone system.

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