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I want to set a cronjob entry that runs a script every 30 minutes from 9:00 to 18:00 but I do not want it to run at 18:30. The script should run for the first time at 9:00 and for the last time at 18:00. Is this possible?

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The question was answered here. – user1405441 Jun 28 '12 at 16:38

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up vote 11 down vote accepted 
0,30 9-18 * * * /path_to_script

However, the above will run at 18:30. So, you're best bet is to have a separate job to handle 18:00. So:

0,30 9-17 * * * /path_to_script
0 18 * * * /path_to_script

Also, Cron job generators are awesome.

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This is a great answer! – dotancohen Jun 28 '12 at 16:48
I was wishing to accomplish this in a single line but I later learned that it was not possible only using cron. Thanks for your answer. – user1405441 Jun 28 '12 at 16:57
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Or do an extra test before firing the script. In the example below I test if current is less than 1815.

 0,30 9-18 * * * [ $(date +\%H\%M) -le 1815 ] && /path_to_script
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