As we've asked you before Satyaveer Arya, would you PLEASE
stop just posting links from a Google search? Can you try to actually provide answers?
OP, you need to read the man page on the sort command (type in "man sort" in a terminal window). Pay attention to the "-k" and the "-t" fields. Putting in "sort -k 2 <filename>" will work. Again, read the man page on the sort command if you need it reverse ordered, or need to sort more on the month fields, too.