Misc

Mailto

MAILTO=email1@mydomain.com
MAILTO="email1@mydomain.com,email2@mydomain.com"

Cron schedule

https://crontab.guru/

at, batch, atq, atrm – queue, examine, or delete jobs for later execution

at 3:30 tomorrow
at>clamscan -i /home/user | mail user@example.com
at> <CTRL-D> 
job 3 at 2005-04-28 03:30