count

Hi,

I created a little script, because i needed some functionality that i
didnot 
know of how to do it in another way

the script: (stored in a file named 'count')
#!/bin/awk -f

{
        if (a==$0) {
                i++;
        } else {
                if (a=="") {
                        ++i;
                } else {
                        print a, ++i;
                }
                i=0;
                a=$0;
        }
}

END { print a, ++i; }


With this script i can do this:
if i have a textfile with these contents:
aaaa
aaaa
aaaa
bbb
bbb
cccc
cccc
cccc
cccc
the output of 'count textfile' will be:
aaaa 3
bbb 2
cccc 4
(so, basically counting the different values)

Does anyone have a clue if there is a 'standard' util/tool under linux
which 
can do this?
(because i think this simple/basic functionality could be usefull 
sometimes...)


-- 
Luuk