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Running a cron every 30 seconds

... You have */30 in the minutes specifier - that means every minute but with a step of 30 (in other words, every half hour). Since cron does not go down to sub-minute resolutions, you will need to find another way. One possibility, though it's a bit of a kludge(a), is to have two jobs, one offset ...
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Compare two files in Visual Studio

...on tool in VS 2012 for comparing two files or two versions of file. I like it. But when I tried to find it I can't because I don't use TFS. Is there a way how can I just compare two files with builtin feature in VS but without TFS? ...
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Are there any downsides to passing structs by value in C, rather than passing a pointer?

...es of those structs will get placed on the stack, potentially causing the situation that this site is named after... If I see an application that seems to have excessive stack usage, structs passed by value is one of the things I look for first. ...
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__FILE__ macro shows full path

...follow | edited Apr 22 '15 at 20:00 Jayesh 44.6k1919 gold badges6868 silver badges9292 bronze badges ...
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iOS JavaScript bridge

...p), but I'm not sure if there is a library to help create native iOS apps with heavy JavaScript usage. I need to: 9 Answers...
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How to read/write from/to file using Go?

...ing to learn Go on my own, but I've been stumped on trying read from and write to ordinary files. 8 Answers ...
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Java null check why use == instead of .equals()

... to see if two objects are equal according to their contract for what equality means. It's entirely possible for two distinct object instances to be "equal" according to their contract. And then there's the minor detail that since equals is a method, if you try to invoke it on a null reference, you'...
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Is Tomcat running?

... Why grep ps, when the pid has been written to the $CATALINA_PID file? I have a cron'd checker script which sends out an email when tomcat is down: kill -0 `cat $CATALINA_PID` > /dev/null 2>&1 if [ $? -gt 0 ] then echo "Check tomcat" | mailx -s "T...
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Internal Error 500 Apache, but nothing in the logs?

...sed to the scripts error logs usually has the (more) specific error. often it will be permissions denied or even an interpreter that can't be found. This means the fault almost always lies with your script. e.g you uploaded a perl script but didnt give it execute permissions? or perhaps it was corr...
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Git: How to rebase to a specific commit?

I'd like to rebase to a specific commit, not to a HEAD of the other branch: 9 Answers ...