# acme.sh > Shell script implementing ACME client protocol, an alternative to `certbot`. > See also `acme.sh dns`. > More information: . - Issue a certificate using webroot mode: `acme.sh --issue --domain {{example.com}} --webroot {{/path/to/webroot}}` - Issue a certificate for multiple domains using standalone mode using port 80: `acme.sh --issue --standalone --domain {{example.com}} --domain {{www.example.com}}` - Issue a certificate using standalone TLS mode using port 443: `acme.sh --issue --alpn --domain {{example.com}}` - Issue a certificate using a working Nginx configuration: `acme.sh --issue --nginx --domain {{example.com}}` - Issue a certificate using a working Apache configuration: `acme.sh --issue --apache --domain {{example.com}}` - Issue a wildcard (\*) certificate using an automatic DNS API mode: `acme.sh --issue --dns {{dns_cf}} --domain {{*.example.com}}` - Install certificate files into the specified locations (useful for automatic certificate renewal): `acme.sh --install-cert -d {{example.com}} --key-file {{/path/to/example.com.key}} --fullchain-file {{/path/to/example.com.cer}} --reloadcmd {{"systemctl force-reload nginx"}}`