[RT @gray_dot_bmp]
TODAY I LEARNED that `cat file1 > file2` on Btrfs will just create a reflink instead of reading & writing all data

¹ thanks to the magic of copy_file_range()

I know `cp file1 file2` in new coreutils will reflink and it's a nice feature, but for `cat` it's really unexpected lol

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@mirek Yeah, I run `cat file1 > file2` twice a day, because it is so important for data processing 🤣 🙄

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