Set crontab in OSX

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Just follow these steps: In Terminal: crontab -e. Press i to go into vim's insert mode. Type your cron job, for example: 30 * * * * /usr/bin/curl --silent --compressed http://example.com/crawlink.php Press Esc to exit vim's insert mode. Type ZZ to exit vim (must be capital letters).  You should see the following message: crontab: installing new crontab. You can verify the crontab file by using crontab -l. Note however that this might not work depending on the content of your ~/.vimrc file.

from : http://stackoverflow.com/questions/15395479/why-ive-got-no-crontab-entry-on-os-x-when-using-vim