Modification Time (mtime)
A file's modification time describes when the content of the file most recently changed. Because most file systems do not compare data written to a file with what is already there, if a program overwrites part of a file with the same data as previously existed in that location, the modification time will be updated even though the contents did not technically change.
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“In time even the rocks will grow. And if you have curled and dandled
Your innocence once too often, what attitude isn’t then really yours?”
—John Ashbery (b. 1927)