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dfコマンドはどこからファイルシステムの統計を取得するのか - Plan 9とGo言語のブログ
(blog.lufia.org)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
One of the reasons is it makes moderation (including soft moderation by users like downvotes or reports) harder. Users not familiar with Japanese can't decide whether the post follows the rule and is on topic.
There are no rules against non-English posts. If you can’t understand it, don’t vote against it. That’s a discriminatory reaction, just keep scrolling if you don’t read Japanese. If the mods want to restrict languages, they have every ability to do so.