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When should I use perror(“…”) and fprintf(stderr, “…”)?

Reading the man pages and some code did not really help me in understanding the difference between - or better, when I should use - perror("...") or fprintf(stderr, "...") . ...
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CURL to access a page that requires a login from a different page

I have 2 pages: xyz.com/a and xyz.com/b . I can only access xyz.com/b if and only if I login to xyz.com/a first. If accessing xyz.com/b without going through the other, I simply get access denied (no redirect to login) via the browser. Once I login at xyz.com/a , I can access the other. ...
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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?

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How to percent-encode URL parameters in Python?

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is of a type that is invalid for use as a key column in an index

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Difference between Xcode version (CFBundleShortVersionString) and build (CFBundleVersion)

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How to change ViewPager's page?

I'm using ViewPager in my app and define it in the main Activity. Inside onCreate method I load some number of pages from SharedPreferences and then pass it to PagerAdapter: ...
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How can I make a JUnit Test wait?

I have a JUnit test that I want to have wait for a period of time, synchronously. My JUnit test looks like this: 6 Answers ...
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request exceeds the configured maxQueryStringLength when using [Authorize]

I have a MVC3 site in C#, I have a particular view being fed query parameters from a JavaScript function, the function redirects to the site via ...
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How to Diff between local uncommitted changes and origin

Let's say I cloned a repository and started modifying files. I know that if I have local uncommitted changes, I can do a diff as follows git diff test.txt and it will show me the difference between the current local HEAD and the modified, uncommitted changes in the file. If I commit those changes ...