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Subject: Re: How to implement line sorting, uniquifying and counting function in emacs?
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Sorting:

  M-x apropos sort-.* RET

Counting:

  M-x apropos count.*lines RET

The only non-trivial part is uniquifying of buffer lines:

  M-x query-replace-regexp ^\(.*^Q^J\)\1+ \1 RET

where you need to type ^Q^J as C-q C-j, of course.  A non-interactive
variant should be as easy as the interactive.