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How to “grep” for a filename instead of the contents of a file?

grep is used to search within a file to see if any line matches a given regular expression. However, I have this situation - I want to write a regular expression that will match the filename itself (and not the contents of the file). I will run this from the system's root directory, to find all thos...
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How to find if a given key exists in a C++ std::map

I'm trying to check if a given key is in a map and somewhat can't do it: 14 Answers 14...
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How to succinctly write a formula with many variables from a data frame?

Suppose I have a response variable and a data containing three covariates (as a toy example): 6 Answers ...
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Why do we need virtual functions in C++?

I'm learning C++ and I'm just getting into virtual functions. 26 Answers 26 ...
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Error to use a section registered as allowDefinition='MachineToApplication' beyond application level

The top line in all of my aspx pages in my /portal/ directory has this error message, and I know it's a common one. I have googled this error message to no end, and I see a lot of posts telling me to configure the /portal/ folder as an application in IIS (which I have), and more posts telling me I ...
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how to remove the dotted line around the clicked a element in html

I found that if there is a a link in the page which does not link to a new page,then when user click it,there will be a dotted line around the element,it will only disappear when user click anything else in the page,how to remove this? ...
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Join a list of items with different types as string in Python

I need to join a list of items. Many of the items in the list are integer values returned from a function; i.e., 9 Answ...
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Getting root permissions on a file inside of vi? [closed]

Often while editing config files, I'll open one with vi and then when I go to save it realize that I didn't type 10 Answers...
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How to declare an array in Python?

How do I declare an array in Python ? 16 Answers 16 ...
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Significant new inventions in computing since 1980

This question arose from comments about different kinds of progress in computing over the last 50 years or so. 129 Answer...