symbol count in a text file [iptables log]

[m.w.chang]

further to my questino on an analysis tool for iptables log.

is there a unix textutils or alike that would count the number of unique 
symbols in a text file and produce a frequency distribition of them? It 
should be a common feature in most compilers. I could write one, but 
just wonder whether the wheel has been available already.

with that tool, I could just count the symbol DPT=9999.

Reminded me of the book I dare to read: The C Compiler. Is this a kind 
of lexical analysis?

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