Mac OS X Quarter Hour Timer via This Supervising Crontab (Ideally suited for MAMP, and left running) - RJM Programming - June, 2016

0,15,30,45 * * * * /usr/sbin/screencapture -Cd -tjpg /Applications/MAMP/htdocs/screen-`date +"\%Y\%m\%d-\%H\%M"`.jpg

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