unix pipes are multidimensional via fifo. I have done like follows when I want a poor mans "GROUP BY" mkfifo p1 cat data | tee p1 | awk '{print $5}' | sort | u

unix pipes are multidimensional via fifo. I have done like follows when I want a poor mans "GROUP BY" mkfifo p1 cat data | tee p1 | awk '{print $5}' | sort | uniq -c | join -1 5 -2 1 -o 1.1,2,2.1,1.2,2.2,2.3 - p1