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End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

File::Stat#blksize

stat.blksize → integer or nil

Returns the native file system’s block size. Will return nil on platforms that don’t support this information.

Example
File.stat("testfile").blksize   #=> 4096
See also #birthtime #blockdev? #atime #blocks also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0