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bug#34110: feature request: dual-column du output, showing "real" and "o
bug#34110: feature request: dual-column du output, showing "real" and "on-disk" sizes (and about that "apparent-size" concept)
Wed, 16 Jan 2019 16:28:14 -0800
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0
I like the idea of two columns at once.
with "--apparent-size", du returns the actual file size; without, it returns
how large the file appears to be (judging from its disk footprint).
The "apparent" size is the size that "ls -l" outputs, and is the size
that traditional I/O operations like 'read' and 'write' deal with,
regardless of the underlying implementation (where the size might be
smaller or larger than the "apparent" size). In contrast the "disk
usage" size is whatever the filesystem tells us it is. I wouldn't call
either size the "actual" size these days, as even the disk usage (or
"disk footprint") might be virtual blocks stored in a lower-level
compressed device, and there's no way "du" can find out how much of the
lower-level device is being used.
bug#34110: feature request: dual-column du output, showing "real" and "on-disk" sizes (and about that "apparent-size" concept),
Paul Eggert <=