The method dup2() duplicates file descriptor fd to fd2, closing the latter first if necessary.
fd -- This is File descriptor to be duplicated.
fd2 -- This is Duplicate file descriptor.
#!/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 1000 fd2 = 1000 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 we run above program, it produces following result:
Read String is : This is test Closed the file successfully!!