script3.sh

#!/bin/bash

echo 'Enter a number: '
read num1
echo 'Enter in a bigger number: '
read num2

if [ $num1 -gt $num2 ]
then
    echo "ERROR"
    exit 2
else
    echo "The ordinary files in the directory $1 that are between $num1 bytes and $num2 bytes in size are the following:"
    echo
    for f in `ls $1`
    do
        if [ -f $f ] ; then
            size=$(wc -c "$f" | cut -f 1 -d ' ')
            if [[ $size -ge $num1 ]] && [[ $size -le $num2 ]] ; then
                echo "$f is $size bytes"
            fi
        fi
    done
fi