Archive completed tasks in Org mode

You might have a tasks.org file where all your todos and timekeeping is placed. After a while the file gets really big and thus you need to archive the old entries that are either completed or cancelled. Here are the commands (which I found from stackoverflow.com) to clean up your tasks file:

For achiving only one heading

1. C-c C-x A

For archiving headings in bulk

1. M-m o a t r (Open agenda view for the buffer)
   • M-m o a (Opens Agenda)
   • < (Narrows down to this buffer)
   • t (Shows TODO entries)
2. 2 r (Show all DONE entries)
3. m (Mark for bulk action)
4. B A (Bulk Archive)
   • B (Bulk action on marked entries)
   • A (Archive the entries)