apparently cronie, dcro, fcron, and others install the actual cron daemon (crond) and other stuff. crond is still the underlying daemon.
That’s not true. The post you linked even says that:
Dcron, cronie, fcron and vixie-cron are cron implementations.
These are all independent programs, all of which happen to provide a program with the same name. Just like MySQL and MariaDB are different programs, but both provide the mysql daemon.
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Yes, and much like Oracle vs Percona vs MariaDB MySQL flavors they are largely indistinguishable unless you possess a fairly high degree of sophistication.
I guess there is no love for the at command.
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