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How do I duplicate a whole line in Emacs?

I saw this same question for VIM and it has been something that I myself wanted to know how to do for Emacs. In ReSharper I use CTRL-D for this action. What is the least number of commands to perform this in Emacs? ...
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Why doesn't git recognize that my file has been changed, therefore git add not working

I am trying to push my files to github using bash. They are already on there, and I am uploading a newer version with new lines and code, etc. But when I try git add and then git status it says: ...
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What's the difference between encoding and charset?

I am confused about the text encoding and charset. For many reasons, I have to learn non-Unicode, non-UTF8 stuff in my upcoming work. ...
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How do I remove a MySQL database?

...otice from my last question that a problem caused some more problems, Reading MySQL manuals in MySQL monitor? 6 Answers ...
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Untrack files from git temporarily

I have setup a local git on my machine. When I initialized git, I added pre-compiled libs and binaries. However, now during my development I don't want to check in those files intermittently. I dont want to remove these files from repo. Is there any way to not keep a track of these files till I comp...
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UltiSnips and YouCompleteMe

I have bundles ultisnips and youcompleteme installed on my macvim. The problem is that ultisnips doesn't work because tab is bound by ycm. I tried putting let g:UltiSnipsExpandTrigger = "<s-tab>" so that I can trigger the snippet completion with shift-tab, but it doesn't work for some unknow...
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find: missing argument to -exec

I was helped out today with a command, but it doesn't seem to be working. This is the command: 10 Answers ...
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How can I use xargs to copy files that have spaces and quotes in their names?

I'm trying to copy a bunch of files below a directory and a number of the files have spaces and single-quotes in their names. When I try to string together find and grep with xargs , I get the following error: ...
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How to reposition Chrome Developer Tools

The tools are opened on the bottom of the chrome window per default. This is a rather bad choice for a wide screen display since there is plenty of empty space to the right but not much vertical space to spare. Unfortunately, I have found no way to reposition the tools. I would like to have them on ...
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What's the state of the art in email validation for Rails?

What are you using to validate users' email addresses, and why? 13 Answers 13 ...