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redirects error output to "no where"
it is a common trick in programming unix

Why I used...
wanted to do a number comparison on a field
if number comparison was with a number, could do it
if...

I added a couple things in the middle of the program! (commented out one line; two new lines)

> cat conv_form
#! /bin/bash
#conv_form

ifile=file1
ofile=file9
rm $ofile 2>/dev/null
first=0...

script:
> cat conv_form
#! /bin/bash
#conv_form

ifile=file1
ofile=file9
rm $ofile 2>/dev/null
first=0

while read zf
do
fourc=$(echo "$zf" | cut -c1-4)
if [ $fourc -gt 1 ]...

You also show a drop of:
space character
first double-quote

Also, are all starting prefixes four digits?
Is there a range of numbers? i.e. >1000 and <2000 ?

Perhaps I am missing something, but it appears that you are trying to eliminate single-instance <cr> <lf> between lines, but maintain when there are consecutive <cr> <lf> pairs. Thus, turn 6-7 lines...