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Google is preparing to let you run Linux apps on Android, just like Chrome OS
(www.androidauthority.com)
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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.
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My sense was that it's kinda like cygwin. Just natively compiled apps and a filesystem layout.
This is correct. There's no containerization like LXC/Docker.
Not even that, Android is enough of a Linux system they really just needed a repo of natively compiled apps.
...and a filesystem layout. They don't install things to the "root" linux so they have their own /var, /bin, /usr, etc.
I could remember wrong, but doesn't it just use symlinks?
I doubt it - it runs in an android sandbox. Why would they even bother? it's easier to just create a filesystem "chroot" and use that. That way you get full read/write and control of versions.