Be carefull when using crontab, "crontab -e" could be handy for edit/write crontab command but also crontab have delete command "crontab -r", this command will delete all user crontab without prompt, the problem is e and r is very close, this problem happen to me , my crontab command suddenly missing, when i search for this problem, i found that crontab -r is deleting crontab command and i just run it accidentally
Source : https://serverfault.com/questions/235309/crontab-definitions-disappearing
zuka.one
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