Shell Script to Create a File with Specified Number of Lines

#!/bin/bash
#
# SCRIPT:  bigfile.sh
# PURPOSE: This script is used to create a text file that
#          has a specified number of lines that is specified
#          on the command line.
#

usage()
{
echo "............USAGE ERROR............"
echo "USAGE: $0 <number_of_lines_to_create>"
}

# Argument Checking

if [ $# -ne 1 ]             # Looking for exactly one parameter
then
     usage                    # Usage error was made
     exit 1                    # Exit on a usage error
fi

# Define files and variables here

LINE_LENGTH=80              # Number of characters per line
OUT_FILE=bigfile.$$          # New file to create
>$OUT_FILE                       # Initialize to a zero-sized file
TOTAL_LINES=$1               # Total number of lines to create
LINE_COUNT=0                 # Character counter
CHAR=X                             # Character to write to the file

#   Beginning of Main

while ((LINE_COUNT < TOTAL_LINES))          
do
     CHAR_COUNT=0        # Initialize the CHAR_COUNT to zero on every new line

     while ((CHAR_COUNT < LINE_LENGTH))     # Each line is fixed length
     do
          echo -e "$CHAR\c" >> $OUT_FILE      # Echo a single character
          let CHAR_COUNT++                          # Increment the character counter
     done

     let LINE_COUNT++                       
     echo>>$OUT_FILE                                    # Give a newline character
done