Take out shebang from shell definition and add it when script is writ…

…ten. (#181)

* Take out shebang from shell definiton and at it when script is written.

* Include shebang in cmd and fix format of string written to file.

maestrowf/interfaces/script/localscriptadapter.py

@@ -57,7 +57,7 @@ def __init__(self, **kwargs):
         """
         super(LocalScriptAdapter, self).__init__()
 
-        self._exec = kwargs.pop("shell", "#!/bin/bash")
+        self._exec = kwargs.pop("shell", "/bin/bash")
 
     def _write_script(self, ws_path, step):
         """
@@ -82,18 +82,14 @@ def _write_script(self, ws_path, step):
         fname = "{}.sh".format(step.name)
         script_path = os.path.join(ws_path, fname)
         with open(script_path, "w") as script:
-            script.write(self._exec)
-            _ = "\n\n{}\n".format(cmd)
-            script.write(_)
+            script.write("#!{0}\n\n{1}\n".format(self._exec, cmd))
 
         if restart:
             rname = "{}.restart.sh".format(step.name)
             restart_path = os.path.join(ws_path, rname)
 
             with open(restart_path, "w") as script:
-                script.write(self._exec)
-                _ = "\n\n{}\n".format(restart)
-                script.write(_)
+                script.write("#!{0}\n\n{1}\n".format(self._exec, restart))
         else:
             restart_path = None