I want to cp a directory but I do not want to overwrite any existing files even it they are older than the copied files. And I want to do it completely noninteractive as this will be a part of a Crontab Bash script. Any ideas? ...

I want to show my users PDF files. The reason why I use cgi to show the pdf is I want to track the clicks for the pdf, and cloak the real location of the saved pdf. ...

I have a hex color, e.g. #F4F8FB (or rgb(244, 248, 251) ) that I want converted into an as-transparent-as-possible rgba color (when displayed over white). Make sense? I'm looking for an algorithm, or at least idea of an algorithm for how to do so. ...

I want to use the index of the parent list (foos) as an argument to a function call in the child list (foos.bars). 6 Answer...

I've been running my app on an iPhone 5 /iOS 6, but when I try to run it on an iPhone 4S / iOS6 I get "The run destination iOS Device is not valid for running the scheme NN. The Scheme contains no buildables that can be built for the architectures supported by the run designation device". ...

I have installed ubuntu Lamp stack. But the curl is not enabled, neither can I can find the extension listed in the INI file. I added manually but it didn't work either. ...

Is it possible to row bind two data frames that don't have the same set of columns? I am hoping to retain the columns that do not match after the bind. ...

How can I convert a Django QuerySet into a list of dicts? I haven't found an answer to this so I'm wondering if I'm missing some sort of common helper function that everyone uses. ...

What is the difference between an abstract function and a virtual function? In which cases is it recommended to use virtual or abstract? Which one is the best approach? ...

How does one convert NSInteger to the NSString datatype? 9 Answers 9 ...