#!/bin/bash
FILE=$1
FROM=$2
TO=$3
if [ "$FILE" = ""]; then
  echo Please provide a filename
  exit 1
fi
if ! [ -f $FILE ]; then
  echo File $FILE does not exists
  exit 2
fi
if [ "$FROM" = "" ]; then
  echo Please provide starting line
  exit 3
fi
if [ "$TO" = "" ]; then
  TO=$(cat $FILE | wc -l)
fi
awk "NR < $FROM { next } { print } NR == $TO { exit }" $FILE