Launchd
@macOS
Get system resource limits
launchctl limit
periodic
Called by launchd to execute shell scripts (very cron)
/etc/periodic/ - scripts
/etc/periodic.conf - override the default periodic config
Resources
http://ss64.com/osx/launchctl.html
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/launchctl.1.html
http://launchd.info/