https://ole.michelsen.dk/blog/schedule-jobs-with-crontab-on-mac-osx.html

Cron Jobs

• https://www.digitalocean.com/community/articles/how-to-use-cron-to-automate-tasks-on-a-vps

• http://www.maclife.com/article/columns/terminal_101_creating_cron_jobs

• http://www.nncron.ru/help/EN/working/cron-format.htm

    # .---------------- minute (0 - 59)
    # |  .------------- hour (0 - 23)
    # |  |  .---------- day of month (1 - 31)
    # |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
    # |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
    # |  |  |  |  |
    # *  *  *  *  * user-name  command to be executed

Add/Remove

add and remove rows

    env EDITOR=nano crontab -e

view

    crontab -l

SSH troubles

http://eli.thegreenplace.net/2013/10/08/some-notes-on-logging-and-ssh-access-from-cron-jobs/

http://stackoverflow.com/questions/12020073/how-to-get-rsync-to-recognise-ssh-publickey-when-run-from-script-nodejs

https://help.github.com/articles/working-with-ssh-key-passphrases

http://stackoverflow.com/questions/112396/how-do-i-remove-the-passphrase-for-the-ssh-key-without-having-to-create-a-new-ke

Fix : rsync -a -e "ssh -i /PATH/TO/id_rsa" user@server:/PATH/ /PATH/ ssh key with no passphrase