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$ nawk -F, '{if(a!=$4){print "----------";print $0;a=$4}else{print $0;a=$4}}END{print "-----------"}' input.txt
----------
col1,col2,col3,CODE_0, ... , colN
col1,col2,col3,CODE_0, ... , colN...

Append this in tyler_durden's perl one-liner:
; END{print "-"x40}' f48

try this


awk 'NR%4==0{print "--------------";next;} {print} END{print "--------------"}' filename

If Perl is an option, then here's one way -


$
$
$ cat f48
col1,col2,col3,CODE_0, ... , colN
col1,col2,col3,CODE_0, ... , colN
col1,col2,col3,CODE_1, ... , colN
col1,col2,col3,CODE_1, ......

#!/bin/bash
oldtag=nothing
while read line
do
newtag=(echo $line|cut -d "," -f4)
if [ $oldtag != $newtag ]; then
echo "-------------------------------------" >> newfile
fi
echo $line >>...