How to check if a program is run in Bash on Ubuntu on Windows and not just plain Ubuntu?

Question

Pretty straightforward, the usual places to figure out the OS you\'re on seem to be identical to plain Ubuntu on Ubuntu for Windows. For example uname -a is ide

Answer 1

Here's what I put in my .bashrc

if [[ $(uname -v | sed -rE 's/^#[0-9]{3,}-(\S+).+/\1/') == "Microsoft" ]]; then
  # WSL-specific code
fi

• uname -v gets the kernel version in the format of #379-Microsoft Wed Mar 06 19:16:00 PST 2019 and the sed expression pulls out the Microsoft string.