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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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How to set a Javascript object values dynamically?

... answered Jun 22 '11 at 12:38 Matt GreerMatt Greer 55.4k1515 gold badges116116 silver badges121121 bronze badges ...
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What is the “realm” in basic authentication

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Why specify @charset “UTF-8”; in your CSS file?

...g. Read about the rules for character set resolution of CSS files at the w3c spec for CSS 2. share | improve this answer | follow | ...
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What is the difference between 'log' and 'symlog'?

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Avoiding an ambiguous match exception

... answered Dec 28 '09 at 13:16 Benjamin PodszunBenjamin Podszun 8,96833 gold badges3030 silver badges4040 bronze badges ...
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What is the C# equivalent to Java's isInstance()?

... answered Nov 11 '08 at 23:13 Konrad RudolphKonrad Rudolph 461k118118 gold badges863863 silver badges11101110 bronze badges ...
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Piping buffer to external command in Vim

... 132 You can use :w !cmd to write the current buffer to the stdin of an external command. From :help...
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how do I strip white space when grabbing text with jQuery?

... 333 Use the replace function in js: var emailAdd = $(this).text().replace(/ /g,''); That will r...
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Python: Get the first character of the first string in a list?

... 139 You almost had it right. The simplest way is mylist[0][0] # get the first character from the...