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compsize takes a list of files (given as arguments) on a btrfs filesystem
and measures used compression types and effective compression ratio,
producing a report such as:
[~]$ compsize /usr/share
Processed 120101 files.
Type Perc Disk Usage Uncompressed
Data 58% 1.1G 1.9G
none 100% 351M 351M
zlib 29% 41M 137M
lzo 51% 776M 1.4G
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