Hi Aparna

You have multiple types of files and unknown count of each . I don't have a single liner as you asked for. But a slighter smaller version than you have in hand. Please try this to see if its of any use

#/bin/ksh
for i in "cpu" "vmem" "mem"
do
paste -d"," *.${i} > ${i}.out
done

As you guess, it makes three files cpu.out, vmem.out and mem.out!!!