Question: How to detect the Operation from a Bash script?

Bash-Platform-Compatible

# Get idea on: https://stackoverflow.com/a/18434831
case "$OSTYPE" in
    msys*)
        echo "OS: Window" 
        export PY_CMD=python
        export ACTIVATE_DIR=Scripts
    ;;
    linux*)
        echo "OS: Linux"
        export PY_CMD=/usr/local/bin/python3.9
        export ACTIVATE_DIR=bin
    ;;
    *)
        echo "Not supported for OS $OSTYPE" 
    ;;
esac