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certbot is a python command-line client to get X.509 certificates from the Let’s Encrypt authority in order to allow a web server using https to be accepted by most browsers.

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The actual command run by cron is: test -x /usr/bin/certbot -a \! -d /run/systemd/system && perl -e 'sleep int(rand(3600))' && certbot -q renew It starts by testing some files test -x /usr/bin … /certbot -a \! -d /run/systemd/system which translates in does /usr/bin/certbot exist and is executable (-x /usr/bin/certbot) and not (-a \!) /run/systemd/system exist and is a directory (-d /run …
answered Nov 2 '18 by Rémi Svahn