Single script to run in both Windows batch and Linux Bash?

Question

Is it possible to write a single script file which executes in both Windows (treated as .bat) and Linux (via Bash)?

I know the basic syntax of both, but didn\'t figu

Answer 1

The following works for me without any errors or error messages with Bash 4 and Windows 10, unlike the answers above. I name the file "whatever.cmd", do chmod +x to make it executable in linux, and make it have unix line endings (dos2unix) to keep bash quiet.

:; if [ -z 0 ]; then
  @echo off
  goto :WINDOWS
fi

if [ -z "$2" ]; then
  echo "usage: $0  "
  exit 1
fi

# bash stuff
exit

:WINDOWS
if [%2]==[] (
  SETLOCAL enabledelayedexpansion
  set usage="usage: %0  "
  @echo !usage:"=!
  exit /b 1
)

:: windows stuff