Python OS study notes

Python3 os.chown () method

Outline

os.chown () method is used to change the owner of the file, if you can not modify the set to -1, you need superuser privileges to execute permissions to modify operations.

Supports only be used under Unix.

grammar

chown () method of the following syntax: os.chown (path, uid, gid );

parameter

• path - the path to set permissions for the file that you want to change [this document] where

• uid - their user ID you want to change [to whom]

• gid - User Group [ID that you want to change to a group]

---

 

Python3 os.dup2 () method

Outline

os.dup2 () method is used to copy a file descriptor fd to another fd2. Unix, available on Windows.

grammar

dup2 () method of the following syntax: os.dup2 (fd, fd2);

parameter

• fd - the file descriptor to be copied

• FD2 - Copy the file descriptor

OS Import 
 
# open a file 
F = Open ( 'TXT', 'A') 
 
# file represented by file descriptor, a file descriptor is transmitted to points (i.e. stdout) 
os.dup2 (f.fileno () , 1) 
 
# close the file 
f.close () 
 
# Print output to the standard output stream, the file descriptor is a 
Print ( 'runoob') 
Print ( 'Google')

 The feeling is supposed to be output to the output to a file on the screen

---