#!/bin/sh

# print the nth line or a range of lines from start inclusively to end exclusively.

if test 0 -eq $#
then
  echo arguments: from [to]
fi

if test 2 -eq $#
then
  end=$(($2 - 1))
  sed -n $1,$end'p'
fi

if test 1 -eq $#
then
  sed -n $1p
fi