Detect BashOnWindows from Bash script

[timmontague]

Is there a documented method for a Bash script to detect if it's running on "Ubuntu on Windows" vs native Ubuntu?

It looks like grepping /proc/version for the string "Microsoft" would work, but it could potentially have false positives.

For reference, these are the contents of /proc/version on my machines:

• Ubuntu on Windows:
  Linux version 3.4.0-Microsoft ([email protected]) (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Wed Dec 31 14:42:53 PST 2014
• Native Ubuntu:
  Linux version 4.4.0-31-generic (buildd@lgw01-16) (gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1) ) #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016

My Windows build number: Microsoft Windows [Version 10.0.14393]

[benhillis]

I would suggest /proc/sys/kernel/osrelease

Duplicate of #423

[timmontague]

Thank you!

[matthewpersico]

How about uname -r which does the same thing?