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How would I get a cron job to run every 30 minutes?

I'm looking to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something close. I have the following, but it doesn't seem to run on 0. ...
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Show data on mouseover of circle

... answered May 29 '12 at 20:25 Lars KotthoffLars Kotthoff 98.3k1313 gold badges176176 silver badges180180 bronze badges ...
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jQuery equivalent of getting the context of a Canvas

... Try: $("#canvas")[0].getContext('2d'); jQuery exposes the actual DOM element in numeric indexes, where you can perform normal JavaScript/DOM functions. share ...
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Drawable image on a canvas

...| edited Dec 15 '18 at 12:07 answered Apr 8 '14 at 8:36 Gá...
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how to override left:0 using CSS or Jquery?

... answered Apr 11 '12 at 9:06 Jan HančičJan Hančič 48.2k1515 gold badges8787 silver badges9494 bronze badges ...
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How to change checkbox's border style in CSS?

...I change checkbox (input) border's style? I've put border:1px solid #1e5180 upon it, but in FireFox 3.5, nothing happens! ...
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How do I kill background processes / jobs when my shell script exits?

... | edited Dec 12 '08 at 16:33 answered Dec 11 '08 at 17:57 ...
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Install dependencies globally and locally using package.json

... | edited Jun 20 at 9:12 Community♦ 111 silver badge answered May 30 '12 at 9:05 ...
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Check if user is using IE

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Split a String into an array in Swift?

... like so: var fullName = "First Last" var fullNameArr = split(fullName) {$0 == " "} var firstName: String = fullNameArr[0] var lastName: String? = fullNameArr.count > 1 ? fullNameArr[1] : nil with Swift 2 In Swift 2 the use of split becomes a bit more complicated due to the introduction of t...