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The 6 test patterns that real-world Bash scripts actually use

Check if a file is really a file, whether a string contains anything, and whether you can run a program with these vital patterns.
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Checking for Null or Empty or White Space Only String in Java

.NET Framework 4 introduces a new method on its String class called IsNullOrWhiteSpace that checks whether a provided String is null, empty, or consists only of “white space.” This handy method is in ...