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acme.sh: A pure Unix shell script implementing ACME client protocol

github.com/Neilpang/acme.sh

Repository

acmesh-official/acme.sh

A pure Unix shell script ACME client for SSL / TLS certificate automation

Shell · 47,845 stars · GPL-3.0 · last push October 22, 2026 · Homepage

What Jamie wrote

ACME is Let's Encrypt protocol for managing encryption certificates. There are a number of clients but one in pure bash would make it easy to add certificates in a variety of situations.