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$ crontab -l 5 5 * * * touch cron_ran_`date| tr ' :' '_'` ... $ crontab -l | grep -v touch | crontab $ crontab -l 10 10 * * * doSomethingOrOther
5 5 * * * touch cron_ran_`date| tr ' :' '_'` && crontab -l | grep -v t +ouch | crontab 10 10 * * * doSomethingOrOther