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How can I check if a directory exists in a Bash shell script?

What command can be used to check if a directory exists or not, within a Bash shell script? 35 Answers ...
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What are the advantages of using the C++ Boost libraries? [closed]

So, I've been reading through and it appears that the Boost libraries get used a lot in practice (not at my shop, though). Why is this? and what makes it so wonderful? ...
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Rename a class in Xcode: Refactor… is grayed out (disabled). Why?

Why is Refactor... grayed out (disabled) in Xcode? 10 Answers 10 ...
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Eclipse IDE: How to zoom in on text?

I want the same behaviour Firefox has, when you use the scroll button in the mouse to zoom in and out on the current view. Is there something like it for eclipse? ...
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What's the difference between [ and [[ in Bash? [duplicate]

...You no longer have to quote variables like mad because [[ handles empty strings and strings with whitespace more intuitively. For example, with [ you have to write if [ -f "$file" ] to correctly handle empty strings or file names with spaces in them. With [[ the quotes are unnecessary: if [[ -f ...
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How to delete a row by reference in data.table?

My question is related to assignment by reference versus copying in data.table . I want to know if one can delete rows by reference, similar to ...
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What are these ^M's that keep showing up in my files in emacs?

So I think it may have to do with textmate, but we work in a small team and are having some issues with full-file conflicts of nearly identical files in git because each line of one branch has a ^M appended to it. ...
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How to convert a column number (e.g. 127) into an Excel column (e.g. AA)

How do you convert a numerical number to an Excel column name in C# without using automation getting the value directly from Excel. ...
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Determine if Python is running inside virtualenv

Is it possible to determine if the current script is running inside a virtualenv environment? 16 Answers ...
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Why doesn't C++ have a garbage collector?

I'm not asking this question because of the merits of garbage collection first of all. My main reason for asking this is that I do know that Bjarne Stroustrup has said that C++ will have a garbage collector at some point in time. ...