detect os in bash

detect-os.sh

#!/bin/sh


UNAME=$(uname)

if [ "$UNAME" == "Linux" ] ; then
	echo "Linux"
elif [ "$UNAME" == "Darwin" ] ; then
	echo "Darwin"
elif [[ "$UNAME" == CYGWIN* || "$UNAME" == MINGW* ]] ; then
	echo "Windows"
fi

Do you know how this could be adapted to distinguish between running Linux and running WSL? WSL results in a linux output because it is technically Linux afterall.

Identify WSL

uname -r will definately identify a WSL installation:

4.4.0-18362-Microsoft

OS detection script

And that script needs some love. ❤️

#!/usr/bin/env bash

UNAME=$( command -v uname)

case $( "${UNAME}" | tr '[:upper:]' '[:lower:]') in
  linux*)
    printf 'linux\n'
    ;;
  darwin*)
    printf 'darwin\n'
    ;;
  msys*|cygwin*|mingw*)
    # or possible 'bash on windows'
    printf 'windows\n'
    ;;
  nt|win*)
    printf 'windows\n'
    ;;
  *)
    printf 'unknown\n'
    ;;
esac

uname output

🏁 Windows CMD

C:\> ver
Microsoft Windows [Version 10.0.18362.10000]

C:\> uname --version
GNU shellutils 1.9.4

C:\> uname --help
Usage: uname [OPTION]...

  -a, --all        print all information
  -m, --machine    print the machine (hardware) type
  -n, --nodename   print the machine's network node hostname
  -r, --release    print the operating system release
  -s, --sysname    print the operating system name
  -v               print the operating system version

C:\> uname -s
WindowsNT
C:\> uname -r
2
C:\> uname -v
6

WSL ⭕ Ubuntu 18.04

$ uname --version
uname (GNU coreutils) 8.28
$ uname --help
Usage: uname [OPTION]...
Print certain system information.  With no OPTION, same as -s.

  -a, --all                print all information, in the following order,
                             except omit -p and -i if unknown:
  -s, --kernel-name        print the kernel name
  -n, --nodename           print the network node hostname
  -r, --kernel-release     print the kernel release
  -v, --kernel-version     print the kernel version

$ uname -s
Linux
$ uname -r
4.4.0-18362-Microsoft
$ uname -v
#10000-Microsoft Fri Jun 21 11:23:00 PST 2019

👍