To elaborate, here is a c-program way of doing this 
$ date -d "2 days ago" "+%e/%b/%Y"
28/Mar/2011

$ grep "28/Mar/2011" input.txt

[download]
or combine it (might not work on every shell) 
$ grep `date -d "2 days ago" "+%e/%b/%Y"` input.txt

[download]

In reply to Re^2: Optimise the script by Anonymous Monk
in thread Optimise the script by Anonymous Monk

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