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See what process is using a file in Mac OS X

I would like to be able to track a file and see which process is touching that file. Is that possible? I know that I can see the list of open processes in activity monitor but I think it's happening to quickly for me to see it. The reason for this is I'm using a framework and I think the system v...
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Convert data.frame column format from character to factor

I would like to change the format (class) of some columns of my data.frame object ( mydf ) from charactor to factor . 6 ...
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Java Persistence / JPA: @Column vs @Basic

What is the difference between @Column and @Basic annotations in JPA? Can they be used together? Should they be used together? Or does one of them suffice? ...
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How to un-escape a backslash-escaped string?

Suppose I have a string which is a backslash-escaped version of another string. Is there an easy way, in Python, to unescape the string? I could, for example, do: ...
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_=> what does this underscore mean in Lambda expressions?

What does an lambda expression like _=> expr mean? 5 Answers 5 ...
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Git - working on wrong branch - how to copy changes to existing topic branch

...king on a project, but unfortunately, I forgot to switch to my branch, and as such have been working on master 4 Answers ...
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Git undo local branch delete

I just deleted the wrong branch with some experimental changes I need with git branch -D branchName . 8 Answers ...
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How to check for the type of a template parameter?

Suppose I have a template function and two classes 4 Answers 4 ...
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Formatting floats without trailing zeros

How can I format a float so that it doesn't contain trailing zeros? In other words, I want the resulting string to be as short as possible. ...
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How do I delete a fixed number of rows with sorting in PostgreSQL?

I'm trying to port some old MySQL queries to PostgreSQL, but I'm having trouble with this one: 6 Answers ...