#!/bin/bash
# line_no
# Usage: line_no start finish /full/path/to/filename /full/path/to/outfile
# Note:- There is no user error correction code here so don't make any typos.
ifs_str="$IFS"
IFS=$'\n'
# Working part.
n=1
while read -r line
do
	if [ $n -ge $1 ] && [ $n -le $2 ]
	then
		echo -E $line
	fi
	n=$(($n+1))
done < $3 > $4
# End of working part.
cat $4
IFS="$ifs_str"
exit

Last login: Thu Jul 30 22:11:35 on ttys000
AMIGA:barrywalker~> cd Desktop/Code/Shell
AMIGA:barrywalker~/Desktop/Code/Shell> ./line_no 1 1 ~/AudioScope.sh /tmp/text
#!/bin/bash
AMIGA:barrywalker~/Desktop/Code/Shell> ./line_no 3470 3489 ~/AudioScope.sh /tmp/text
#               |        /    --+--     /         | +     /      ------------
#               |     R1 \     / \ D1   \ R2     === C2   \ R3
#               |        /    '---'     /        -+-      /
#               |        \      |       \         |       \ 
#               |        /      |       /         o       /
#               |        |      |       |         |       |       Y
#               +--------o------o-------o---------o---o---o-------O -VE.
#                              Pseudo Ground. ----> __|__
#                                             _GND_ /////
# Parts List:-
# C1 ......... 1 uF, 50V.
# C2 ......... 10 uF, electrolytic, 10V, IMPORTANT! SEE TEXT.
# R1 ......... 33R, 1/8W, 5% tolerance resistor.
# R2 ......... 1M, 1/8W, 5% tolerance resistor.
# R3 ......... 100K, 1/8W, 5% tolerance resistor.
# D1, D2 ..... OA90 or any similar germanium diode.
# 3.2mm standard STEREO jack plug for headset socket.
# Coaxial connecting cable.
# Sundries as required, stripboard, etc, (similar to above).
# #########################################################
AMIGA:barrywalker~/Desktop/Code/Shell> _