#!/bin/bash
#
for FILE in *.csv; do
echo FILE = ${FILE}
awk 'FNR>6{print}' ${FILE} > stripped/${FILE}
done

http://www.unix.com/shell-programming-scripting/110496-awk-find-replace-multiple-files.html

This removes the first six lines from a set of .csv files and writes them to a subdirectory, using awk

strip lines from multiple files

Bash