Python method dup() returns a duplicate of file descriptor fd which can be used in place of the original descriptor.
Following is the syntax for dup() method:
os.dup(fd);
This method returns a duplicate of the 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!!"
When we run the above program, it produces the following result:
Closed all the files successfully!!
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