#!/usr/bin/env python3

import os,sys  # these are your friends for interfacing the OS

print('os.system(\'pwd\')') 
os.system('pwd')  # runs any unix command
print()

print('x=os.popen(\'pwd\').read()')
x=os.popen('pwd').read() # to get output from shell, use popen and read()
print(x)

print('os.system(\'cd ../data\')')
os.system('cd ../data')  # you can't direct the shell from inside python directly
print('os.system(\'pwd\')')
os.system('pwd')
print()

print('os.chdir(\'../data\')')
os.chdir('../data')  # os module controls directories and files
print('os.system(\'pwd\')')
os.system('pwd')
print()

print('x=os.popen(\'ls\').read().split(\'\\n\')')
x=os.popen('ls').read().split('\n') # to get output from shell, use popen and read()
print(x)
print()

print('sys.argv',sys.argv)