#!/bin/rc file = () filename = '' if(~ $#* 1){ file = $1 filename = $1 } awk '{print NR, $0}' $file | sed -n 's/^([0-9]+) (08MAY2018_([0-9]+):([0-9]+):([0-9]+)).*atime=([0-9]+).*/\1 \2 \3\4\5 \6/p' | datecmp | awk '{print("'$filename':" $0)}'