Putting a separator in file using awk/bash

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# 8  
Old 08-16-2013
Does not work if first letter is repeated down in the file like

# 9  
Old 08-16-2013
Yet another alternative assuming a grouped file:

awk -F- 'p!=$1{if(NR>1)print "#"; p=$1}1' file

Last edited by Scrutinizer; 08-16-2013 at 12:58 PM..
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