sum occurrence output of uniq -c

Question

I want to sum up occurrence output of "uniq -c" command. How can I do that on the command line?

For example if I get the following in output, I would need 250.

 45 a4
 55 a3
  1 a1
149 a5

Answer 1

awk '{sum+=$1} END{ print sum}'

Answer 2

This should do the trick:

awk '{s+=$1} END {print s}' file

Or just pipe it into awk with

uniq -c whatever | awk '{s+=$1} END {print s}'