Copy a range of lines from a source file into another file.

range.sh

#!/usr/bin/sh
#############################################################################
#
#   Copy a range of lines from a source file into another file.
#
#   Usage:
#       range.sh <input> <first row> <last row> [<output>]
#
#############################################################################

# Go ahead and output what's going on to stdout.
set -e
set -x

# Initialize values according to user input.
_out=${4-'output'}
_start=`expr $3 - 1`
_count=`expr $3 - $2 + 1`

# Copy the desired range of lines to the output file.
( tail -n +$_start $1 | head -n $_count ) > $_out