filename=monitor.cfg
sectionname=[PROCESS]
p1
p2
filename=ABC.cfg
sectionname=[XYZ]
p3
p4..
so on..

while read cfgfilename sectionname parameter
do
case "$cfgfilename" in
cfgfilename)
FILE=$HOME/config/$parameter
unset SECT
[-f $FILE] || {echo -e $FILE is not found under config directory...} | tee -a $LOGFILE
;;
sectionname)
[-z $FILE] && continue
SECT="$parameter"
while true
do
N=$(grep -Fwnx "$SECT" $FILE | cut -d ':' -f1)
((N)) && break
echo -e $SECT section not found in $FILE ,adding section | tee -a $LOGFILE
echo -e "$SECT\n" >> $FILE
done
;;
*)
if [-n "$FILE"] && [-n "$SECT"]
then
((N++))
sed -i"{$N}" 'i\' "$cfgfilename $sectionname $parameter" $FILE