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git status shows modifications, git checkout — doesn't remove them

I would like to remove all changes to my working copy. Running git status shows files modified. Nothing I do seems to remove these modifications. E.g.: ...
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Is there any way to git checkout previous branch?

I sort of want the equivalent of cd - for git. If I am in branch master and I checkout foo , I would love to be able to type something like git checkout - to go back to master , and be able to type it again to return to foo . ...
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Immutable vs Mutable types

I'm confused on what an immutable type is. I know the float object is considered to be immutable, with this type of example from my book: ...
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Undo a Git merge that hasn't been pushed yet

Within my master branch, I did a git merge some-other-branch locally, but never pushed the changes to origin master. I didn't mean to merge, so I'd like to undo it. When doing a git status after my merge, I was getting this message: ...
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How can I calculate an md5 checksum of a directory?

I need to calculate a summary md5 checksum for all files of a particular type ( *.py for example) placed under a directory and all sub-directories. ...
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Java URL encoding of query string parameters

Say I have a URL 11 Answers 11 ...
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Linux, Why can't I write even though I have group permissions?

I want to create a file in a directory owned by the staff group which I am a member of. Why can I not do this? 6 Answers ...
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Where is debug.keystore in Android Studio

I need to enable google+ api, so I need the debug.keystore . I switched to Android Studio and do not know where it is. I can find it in eclipse at path ~/.android/debug.keystore. ...
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Can I extend a class using more than 1 class in PHP?

If I have several classes with functions that I need but want to store separately for organisation, can I extend a class to have both? ...
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String formatting named parameters?

I know it's a really simple question, but I have no idea how to google it. 6 Answers 6...