You can use cat -b or –number-nonblank options to number nonempty output lines.
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## Add data in your file echo -e "one\n\ntwo\nthree" > myfile ## Adds line no. infront of every lines, even empty ones cat -n myfile ## Returns ## 1 one ## 2 ## 3 two ## 4 three ## Adds line no. to only non-empty lines cat -b myfile ## Returns ## 1 one ## ## 2 two ## 3 three ## Same as cat -b myfile cat -nb myfile ## Returns ## 1 one ## ## 2 two ## 3 three |