Add .sh extension

build/tasks/build-task.coffee

@@ -152,6 +152,7 @@ module.exports = (grunt) ->
 
     if process.platform is 'win32'
       cp path.join('resources', 'win', 'atom.cmd'), path.join(shellAppDir, 'resources', 'cli', 'atom.cmd')
+      cp path.join('resources', 'win', 'atom.sh'), path.join(shellAppDir, 'resources', 'cli', 'atom.sh')
       cp path.join('resources', 'win', 'atom.js'), path.join(shellAppDir, 'resources', 'cli', 'atom.js')
 
     dependencies = ['compile', 'generate-license:save', 'generate-module-cache', 'compile-packages-slug']