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Python: Get system command output

Python Basic: Exercise-102 with Solution

Write a Python program to get system command output.

Sample Solution:-

Python Code:

import subprocess
# file and directory listing
returned_text = subprocess.check_output("dir", shell=True, universal_newlines=True)
print("dir command to list file and directory")
print(returned_text)

Sample Output: 

6d2c5fa0-5ef2-11e6-8ff4-d5b1b3f27f4d  ead74d50-beb7-11e6-933b-47978
84c7124                                                            
6d33f7a0-242d-11e7-820d-03f0e944369f  eae8e560-767d-11e6-a3fc-0fb5e
bee9d44                                                            
6d36f6e0-8616-11e6-affa-0dc8296ec630  eafedbe0-ed01-11e6-a189-7956f
7e10ca1                                                            
6d462c20-758e-11e6-a935-b7db6295ac51  eb190a30-bae6-11e6-a2d1-75a31
a870ce2  
------
7feae620-bece-11e6-ad81-456cada677e8  sss.dat\n                    
7fef9710-7fc2-11e6-97c3-c153b6e0fe23  temp.txt                     
7ff17310-9c22-11e6-9e03-95cb39e2a59d  test.txt                     
801a70f0-4414-11e6-a0ac-5bb3315a1c3b

Flowchart:

Flowchart: Get system command output.

Python Code Editor:

 

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m