Shell Programming and Scripting

cat param.cfg
val1:env1:opt1
val2:env2:opt2
val3:env3:opt3
val4:env4:opt4
.
.

val1:env1:opt1

for i in $( cat refire.cfg | tail +$START | head -$STOP | grep -v "^#" | grep ':' )
do
# read the value of i here and break it down as arguments x y z for this loop
while read x y z 
do
stuff
done
done

OLDIFS=$IFS
IFS=":"

while read A B C; do
   do someting here with $A or $B or $C
done < infile

IFS=$OLDIFS

for i in $( cat rparam.cfg | tail +$RESPONSE | head -$RESPONSESTOP | grep -v "^#" | grep ':' )
 
echo $i
$i > .tempparam
while read x y z
do
<stuff>
done < tempparam
rm -f tempparam
done

RED:value1:Y
RED:value2:Y
#RED:value3:Y
BLUE:value4:Y
RED:value5:Y
RED:value6:Y
BLUE:value7:Y
BLUE:value8:Y
RED:value9:Y
RED:value10:Y
RED:value11:y

awk -F : -v last=${STOP:-0} -v first=${START:-0} '
    /^#/ { next; }
    NR >= first && (last == 0  || NR <= last) {
        print $1, $2, $3, $0
    }

' input-file | while read f1 f2 f3 i
do
        echo "first field: $f1"
        echo "second field $f2"
        echo "third field $f3"
        echo "whole record (i) $i"
done

awk -F : -v last=${STOP:-0} -v first=${START:-0} '
    /^#/ { next; }
    NR >= first && (last == 0  || NR <= last) {
        print $1, $2, $3, $0
    }
 
' input-file | while read f1 f2 f3 i
do