sort: -S/--buffer-size does not support memory percentages % #3500
Description
GNU sort v. Rust sort:
$ /usr/bin/sort --buffer-size=50% < /dev/null
$ target/release/coreutils sort --buffer-size=50% < /dev/null
sort: invalid --buffer-size argument '50%'
Relevant excerpts from GNU sort manpage:
-S, --buffer-size=SIZE
use SIZE for main memory buffer
[...]
SIZE may be followed by the following multiplicative suffixes: % 1% of memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y.
(this could be a good first issue)