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.

Syntax

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

os.dup2(fd,  fd2);

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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.

Example

The following below is a simple example -

#!/usr/bin/python

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!!"

Output

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

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

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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.

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