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Use grep to report back only line numbers

I have a file that possibly contains bad formatting (in this case, the occurrence of the pattern \\backslash ). I would like to use grep to return only the line numbers where this occurs (as in, the match was here, go to line # x and fix it). ...
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R: Comment out block of code [duplicate]

I want to comment out several lines of code in R. Is there any way of doing it without having to put a # before each line - sort of like /* blocked out code */ in SAS? ...
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How can I check if a checkbox is checked?

I am building a mobile web app with jQuery Mobile and I want to check if a checkbox is checked. Here is my code. 14 Answers...
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Creating an empty list in Python

What is the best way to create a new empty list in Python? 5 Answers 5 ...
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Markdown `native` text alignment

Does markdown support native text-alignment without usage html + css ? 11 Answers ...
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Single quotes vs. double quotes in C or C++

When should I use single quotes and double quotes in C or C++ programming? 12 Answers ...
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Algorithm to find top 10 search terms

I'm currently preparing for an interview, and it reminded me of a question I was once asked in a previous interview that went something like this: ...
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How to post data in PHP using file_get_contents?

I'm using PHP's function file_get_contents() to fetch contents of a URL and then I process headers through the variable $http_response_header . ...
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Removing an item from a select box

How do I remove items from, or add items to, a select box? I'm running jQuery, should that make the task easier. Below is an example select box. ...
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Make fill entire screen?

I'm using a radial gradient as the background on my webpage, like so: 9 Answers 9 ...