We now have a youtube channel. Subscribe!

Python os.dup2() Method with example

Hello dear readers! Welcome back to another section of our tutorial on Python. In this tutorial guide, we are going to be studying about the Os dup2() method.

The os dup2() method duplicates file descriptor fd and fd2, closing the latter first if necessary.

Note - New file description would be assigned only when it is made available. In the following example given below, 2000 will be assigned as a duplicate fd in case when 2000 is available.


The following below is the syntax for Python Os dup2() method -

os.dup2(fd,  fd2);

Parameter Details

  • fd - This is the file descriptor that is to be duplicated.
  • fd2 - This is duplicate file descriptor.

Return Value

This method returns a duplicate of file descriptor.


The following below is a simple example -


import os, sys

# Open a file
fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )

# Write one string
os.write(fd, "This is test")

# Now duplicate this file descriptor as 2000
fd2 = 2000
os.dup2(fd, fd2);

# Now read this file from the beginning using fd2.
os.lseek(fd2, 0, 0)
str = os.read(fd2, 100)
print "Read String is : ", str

# Close opened file
os.close( fd )

print "Closed the file successfully!!"

When the above code is executed, it will produce the following result -

Read String is :  This is test
Closed the file successfully!!

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we are going to be studying about the Python OS fchdir() Method.

Feel free to ask your questions where necessary and i will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

Follow us on our various social media platforms to stay updated with our latest tutorials. You can also subscribe to our newsletter in order to get our tutorials delivered directly to your emails.

Thanks for reading and bye for now.

Post a Comment

Hello dear readers! Please kindly try your best to make sure your comments comply with our comment policy guidelines. You can visit our comment policy page to view these guidelines which are clearly stated. Thank you.
© 2023 ‧ WebDesignTutorialz. All rights reserved. Developed by Jago Desain