Python os.dup() Method

Description

The method dup() returns a duplicate of file descriptor fd which can be used in place of original descriptor.

Syntax

Following is the syntax for dup() method

os.dup(fd);

Parameters

• fd -- This is the original file descriptor.

Return Value

This method returns a duplicate of file descriptor.

Example

The following example shows the usage of dup() method.

#!/usr/bin/python

import os, sys

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

# Get one duplicate file descriptor
d_fd = os.dup( fd )

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

# Close a single opened file
os.closerange( fd, d_fd)

print "Closed all the files successfully!!"

Let us compile and run the above program, this will produce the following result:

Closed all the files successfully!!