How to check if running in Cygwin, Mac or Linux?

Question

I have a shell script that is used both on Windows/Cygwin and Mac and Linux. It needs slightly different variables for each versions.

How can a shell/bash script de

Answer 1

Use only this from command line works very fine, thanks to Justin:

#!/bin/bash

################################################## #########
# Bash script to find which OS
################################################## #########

OS=`uname`
echo "$OS"

source