Using Vim and ! commands

[Daniel B. Thurman]

Sorry for asking a dumb question, but I cannot figure out
how to use Vim's command line to either echo the buffer
contents or the current-file using the command (!)
 
What I want is something like this:
 
:!cat <current-buffer OR current-file> | sort | uniq
 
where <current-buffer> OR current-file is used
 
Is there a special keyword that I can use for the
<current-buffer> or <current-filename>?
 
Thanks!
Dan

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