From: Intransition <transfire@...>
Date: 2012-02-07T04:38:00+09:00
Subject: Make a file read-only?

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Hi, I can make a file writeable easy enough,

    mode = File.stat(file).mode
    File.chmod(mode | 0000200, file)

But how do I make a file read-only?

    mode = File.stat(file).mode
    File.chmod(mode - 0000222, file)

Subtraction doesn't work. And I've tried `&`, `|` and `^`. Do I have to do 
some sort compliments operation here? What's the trick to this?

FYI, on the command line it's as easy as:

  $ chmod a-w file


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Hi, I can make a file writeable easy enough,<br><br>&nbsp;&nbsp;&nbsp; mode = File.stat(file).mode<br>&nbsp; &nbsp; File.chmod(mode | 0000200, file)<br><br>But how do I make a file read-only?<br><br>&nbsp;&nbsp;&nbsp; mode = File.stat(file).mode<br>&nbsp; &nbsp; File.chmod(mode - 0000222, file)<br><br>Subtraction doesn't work. And I've tried `&amp;`, `|` and `^`. Do I have to do some sort compliments operation here? What's the trick to this?<br><br>FYI, on the command line it's as easy as:<br><br>&nbsp; $ chmod a-w file<br><br>
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