From mboxrd@z Thu Jan  1 00:00:00 1970
From: zavandi <zavandi@gmail.com>
Subject: Re: deleting N lines of many files
Date: Fri, 17 Dec 2004 15:07:45 +0200
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Fabio Zyserman <zyserman@fcaglp.unlp.edu.ar> wrote:
> I have about eighty directories,
> called data-nn, where nn=00,01,02,....
> in each of these directories I have
> among others, an (ascii) data file with many thousends
> lines. This data file has the same name in all
> directories.
> 
> I would like to know if it is possible,
> via a bash script, to delete the first N
> lines in this data file in all directories.
> The modified file can overwrite the old one.

Maybe you want something along the lines of (not tested!):

for i in `seq -w 0 80`; do sed -i "1,${N}d" $i/filename; done