Python: Find the parent’s process id, real user ID of the current process and change real user ID
Python Operating System Services: Exercise-8 with Solution
Write a Python program to find the parent’s process id, real user ID of the current process and change real user ID.
Sample Solution:
Python Code :
import os
print("Parent’s process id:",os.getppid())
uid = os.getuid()
print("\nUser ID of the current process:", uid)
uid = 1400
os.setuid(uid)
print("\nUser ID changed")
print("User ID of the current process:", os.getuid())
Sample Output:
Parent’s process id: 11069 User ID of the current process: 1000 Traceback (most recent call last): File "/tmp/sessions/caaafe2b92f1fb7d/main.py", line 6, inos.setuid(uid) PermissionError: [Errno 1] Operation not permitted
Python Code Editor:
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Previous: Write a Python program to create a file and write some text and rename the file name.
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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
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