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Run cron job only if it isn't already running

... This wheel was already invented somewhere else :) E.g., serverfault.com/a/82863/108394 – Filipe Correia Jun 8 '13 at 2:27 ...
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Does Python have an ordered set?

... CasebashCasebash 95.7k7878 gold badges229229 silver badges331331 bronze badges ...
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Getting the class name from a static method in Java

.... – James Van Huis Jun 1 '09 at 20:48 9 True. Although MyClass.class will ensure this line doesn'...
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How to get C# Enum description from value? [duplicate]

... answered Apr 16 '10 at 1:48 Nicholas PiaseckiNicholas Piasecki 23.4k44 gold badges7272 silver badges8989 bronze badges ...
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Bash: Strip trailing linebreak from output

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Ubuntu running `pip install` gives error 'The following required packages can not be built: * freety

... | edited Jan 24 '17 at 18:59 Julien Marrec 8,73733 gold badges3434 silver badges5353 bronze badges ans...
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How to get a list of repositories apt-get is checking? [closed]

... | edited Jun 18 '12 at 23:03 Ry-♦ 192k4444 gold badges392392 silver badges403403 bronze badges ...
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Maintain the aspect ratio of a div with CSS

... 1388 Just create a wrapper <div> with a percentage value for padding-bottom, like this: .d...
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Using LINQ to concatenate strings

... sergtk 9,4441313 gold badges6767 silver badges118118 bronze badges answered Oct 20 '08 at 8:53 Jorge FerreiraJorge Ferreira 85...
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How to use XPath in Python?

... | edited Feb 7 '16 at 18:16 Markus Safar 5,60155 gold badges2323 silver badges4040 bronze badges answ...