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use:
cat temp_file |tr -d "\n"

tr (Translate) will delete new line charterer [\n]

cat temp_file |tr -s "\n" " "

consider yout temp file (temp_file) contains:
A1/EXT "BAPBSC10/07B/00" 523 090530 0115
RXOCF-430 HY1711 1
EXTERNAL ALARM
DOOR ALARM
___________________________
#!/usr/bin/ksh
str_tmp=""...

use wait
man wait

wait -await process completion

Use below option to debug it.
This will might help you.

#!/bin/bash -x

this is most recommended for reading a file using while loop.

while read line
do
echo $line
done<"test.dat"

corrected script is here:

#!/bin/bash
#Filename: Assignment Author: Luke Francis
quit=n
while [ "$quit" = "n" ]
do
clear
echo "OPERATOR ADMINISTRATIVE TOOL"
echo...

$ x="asdhasj|lsajdfksa|lsfhkas|"
$ echo $x|sed 's/|//g'
asdhasjlsajdfksalsfhkas