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Cron job every three days

... you want it to run on specific days of the month, like the 1st, 4th, 7th, etc... then you can just have a conditional in your script that checks for the current day of the month. if (((date('j') - 1) % 3)) exit(); or, as @mario points out, you can use date('k') to get the day of the year inst...
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How do I find the location of the executable in C? [duplicate]

...e path, ie, it contains a /, determine the current working directory with getcwd() and then append argv[0] to it. If argv[0] is a plain word, search $PATH looking for argv[0], and append argv[0] to whatever directory you find it in. Note that all of these can be circumvented by the process which i...
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Deleting all pending tasks in celery / rabbitmq

...ee an option to pick a different named queue. Here's my process: $ sudo /etc/init.d/celeryd stop # Wait for analytics task to be last one, Ctrl-C $ ps -ef | grep analytics # Get the PID of the worker, not the root PID reported by celery $ sudo kill <PID> $ sudo /etc/init.d/celeryd stop # ...
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Xcode 4.2 debug doesn't symbolicate stack call

... Nothing I tried would fix this (tried both compilers, both debuggers, etc.) After upgrading XCode for the iOS 5 update, no stack traces seemed to work. However, I have found an effective work-around - creating my own exception handler (which is also useful for other reasons). First, create a f...
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Replacement for deprecated sizeWithFont: in iOS 7?

... a UILabel (not ALWAYS the case, but often so), to prevent duplicated code/etc, you can also replace [UIFont systemFontOfSize:17.0f] with label.font - helps code maintenance by referencing existing data vs. you typing it multiple times or referencing constants all over the place, etc ...
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How to “log in” to a website using Python's Requests module?

...ormally, it simply adds persistence, allowing you to store and use cookies etc. Assuming your login attempt was successful, you can simply use the session instance to make further requests to the site. The cookie that identifies you will be used to authorise the requests. Example import requests ...
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What is the difference between Elastic Beanstalk and CloudFormation for a .NET project?

...the underlying EC2 instances, Elastic Load Balancers, auto scaling groups, etc. This makes it a lot easier for developers, who don't want to be dealing with all the systems stuff, to get their application quickly deployed on AWS. It's very similar to other PaaS products such as Heroku, EngineYard,...
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Argument list too long error for rm, cp, mv commands

...eading NULL-delimited input. And the whole dangerous (broken, exploitable, etc.), is fairly ridiculous. Undoubtedly you should be careful when using xargs, but it is not quite eval/evil. – Reinstate Monica Please Jul 25 '14 at 22:37 ...
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What is the purpose of Serialization in Java?

...rbs, biomedical abbreviations, words semantically connected to each other, etc. The contents of these files are simple: words! Now for each project, I needed to read the words from each of these files and put them into different arrays; as the contents of the file never changed, it became a common...
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Java EE 6 @javax.annotation.ManagedBean vs. @javax.inject.Named vs. @javax.faces.ManagedBean

... managed bean is an object that its life cycle (construction, destruction, etc) is managed by a container. In Java ee we have many containers that manage life cycle of their objects, like JSF container, EJB container, CDI container, Servlet container, etc. All of these containers work kind of ind...