YouTipOs Dup2
# Python2.x Python os.dup2() Method
[ Python OS File/Directory Methods](#)
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### Overview
The os.dup2() method is used to duplicate a file descriptor fd to another fd2.
Available on Unix and Windows.
### Syntax
The syntax for the **dup2()** method is as follows:
os.dup2(fd, fd2);
### Parameters
* **fd** -- The file descriptor to be duplicated.
* **fd2** -- The file descriptor to duplicate to.
### Return Value
This method does not return a value.
### Example
The following example demonstrates the use of the dup2() method:
#!/usr/bin/python# -*- coding: UTF-8 -*-import os, sys # Open a file fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )# Write a string os.write(fd, "This is test")# File descriptor is 1000 fd2 = 1000 os.dup2(fd, fd2);# Insert data on the new file descriptor os.lseek(fd2, 0, 0) str = os.read(fd2, 100)print "The read string is : ", str # Close the file os.close( fd )print "Closed the file successfully!!"
The output of executing the above program is:
The read string is : This is test Closed the file successfully!!
[ Python OS File/Directory Methods](#)