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You can write the variable into a file in the loop

What do you want? Do you want to show file but not directory?
If yes, try this

for file in `ls -lrt * | awk '{print $9}'|grep -v "^d"`
do
if [ -f $file ]; then
echo $file
fi...

Please delete the bold and highlighted ;;

You can extract file extension like this

extension=`expr "$filename" : '.*\(\..*\)'`

There is a dirty method

while read line; do
$number = `cut -d: -f2 $line | cut -d- -f1`
echo $number
loop << fname

mahendramahendr is right

for example
./test 1 2 3 4 5 6 7 8 9 10 11 12


#!/bin/sh

while [ -n "$1" ];do
echo "$1 $2"
shift 2
done

The output should be
1 2
3 4
5 6
7 8
9 10...

$1 is the first input parm
$2 is the second input parm
You can max input 9 parms $1-$9

You should run the script like this

./test_program file_name folder_name

then file_name will be...

Can ifconfig help you?