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The following will work with the data sample you provided. However, it will not work with comments that span multiple lines. If you need something more complicated, you might want to look into using...

#!/bin/ksh
exec 2>/dev/null
ls new_* | while read i
do
if [[ `echo $i` != new_dat.bak ]] && [[ `echo $i | cut -c1-7` != new_ig_ ]]; then
j=`echo "$i"|cut -c5-`
mv $i $j...

$ ls
new_a new_b new_c new_dat.bak new_ig_1 new_ig_2



ls new_* | while read FILE; do
[[ "$FILE" = new_dat.bak ]] || [[ "$FILE" = new_ig* ]] && continue
mv "$FILE" "${FILE#new_*}"...