I am a bit stumped by this. I am no expert at sed/awk/grep, though I can usually find my way around... youngka@vadmin:~/www/nsr_19_data$ grep -iE '^[[:digit:]]+~[0-9 ...

It has been a long time since I did any scripting on Unix. Back in the day, when I was in college, I had done a bit of shell scripting. But that was 10 years back. I do not remember much. So I will ...