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How to make “if not true condition”?

... then .... OR if (( ! $(grep -c "sysa" /etc/passwd) )) ; then .... Finally, there is an award called the Useless Use of Cat (UUOC). :-) Some people will jump up and down and cry gothca! I'll just say that grep can take a file name on its cmd-line, so why invoke extra processes and pipe construc...
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How can I replace every occurrence of a String in a file with PowerShell?

Using PowerShell, I want to replace all exact occurrences of [MYID] in a given file with MyValue . What is the easiest way to do so? ...
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The Concept of 'Hold space' and 'Pattern space' in sed

... line. So what happens is this: first line is read and inserted automatically into the pattern space on the first line, first command is not executed; h copies the first line into the hold space. now the second line replaces whatever was in the pattern space on the second line, first we execute G,...
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Proper way to exit iPhone application?

... it to exit due to certain user actions. After cleaning up memory the app allocated, what's the appropriate method to call to terminate the application? ...
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CRON job to run on the last day of the month

... if that's a problem, you'll need to find another way. However, it's usually both substantially easier and correct to run the job as soon as possible on the first day of each month, with something like: 0 0 1 * * myjob.sh and modify the script to process the previous month's data. This remove...
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How to convert JSON data into a Python object

...ry, the order of items will directly correspond.". Good to know for such small, local code blocks. I'd add a comment though to explicitly alert maintainers of code of such a dependency. – cfi Jun 1 '16 at 7:33 ...
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C++ code file extension? .cc vs .cpp [closed]

... When one considers that the compiler is not typically the only tool involved -- almost always, there is "make" or a similar utility that WILL care which extensions you use, for build rules matching -- then this answer really does not address the core concerns of the questio...
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What is `mt=8` in iTunes links for the App Store?

... @FabianFernandez See here. Its all about affiliation -- stackoverflow.com/questions/17437785/… – Anindya Sengupta Aug 8 '14 at 15:04 ...
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What is the non-jQuery equivalent of '$(document).ready()'?

...library. Someone extracted just the ready part from jQuery. Its nice and small and you might find it useful: domready at Google Code share | improve this answer | follow ...
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connect local repo with remote repo

... git remote add origin <remote_repo_url> git push --all origin If you want to set all of your branches to automatically use this remote repo when you use git pull, add --set-upstream to the push: git push --all --set-upstream origin ...