Как через awk в логе прокси-сервера определить число запрошенных файлов?

[guest@localhost ~]$ awk '{sum[$1]++;} END {for (I in sum) print I, sum[I];}'
a
a
a
b
b
c
a 3
b 2
c 1
[guest@localhost ~]$

   Arrays
       Arrays are subscripted with an expression between square brackets ([ and ]).  If
       the  expression is an expression list (expr, expr ...)  then the array subscript
       is a string consisting of the  concatenation  of  the  (string)  value  of  each
       expression,  separated  by  the  value of the SUBSEP variable.  This facility is
       used to simulate multiply dimensioned arrays.  For example:
 
              i = "A"; j = "B"; k = "C"
              x[i, j, k] = "hello, world\n"
 
       assigns the string "hello, world\n" to the element  of  the  array  x  which  is
       indexed  by  the  string "A\034B\034C".  All arrays in AWK are associative, i.e.
       indexed by string values.