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2answers
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When do inode modification times change? [closed]

I am currently reading UNIX by Bach. I encountered a problem while reading the section on inodes in the 4th chapter. A file modified time is shown as 1:45pm but the inode modified time is shown as ...
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On what occasion will inode change?

I checked manual of find , and there's an option -ctime which specify the last modification time of inode. But on what occasion would inode change ? When is that option useful ?