Shell Programming and Scripting

I have 3 variables

Code:

$file =abc_2011_11_01.txt    (current day file)
$back = Yes
$forward = No

I need to search for 3 days back files / 3 days forward files if my current file is not present

logic is,
I need to download the current day file.
If it is missing, i need to look out for currentday -1 file. (abc_2011_10_31.txt )
If that is missint, i need to check for currentday -2 file (abc_2011_10_31.txt )
If $forward is Yes , then I need to look out for currentday +1 file (abc_2011_11_02.txt )
If that is missing, I need to look out for currentday +2 file (abc_2011_11_03.txt )
IMP : The number of days file to check keeps changing. Eg: it may be 3, 4 or 9 etc...
Also, i need to check every file thrice with a sleep time of 100 seconds

How can i achieve this forward/backward check of files in perl?
Thanks in advance

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