Call Bashfile #BlenderAddon

blender-call-bash-file.py

# http://blender.stackexchange.com/q/76655/31447

import bpy
import subprocess
import os

bpy.ops.mesh.primitive_cube_add(radius=1)

bashfile = '/home/.../hello-world.sh'
os.chmod(bashfile, 0o777) # http://stackoverflow.com/a/1837896
p = subprocess.Popen(bashfile, stdout=subprocess.PIPE)
output, err = p.communicate()
p_status = p.wait()

print (output)

bpy.ops.mesh.primitive_monkey_add(radius=1)

hello-world.sh

#!/bin/bash
echo Hello World