Shell long write to file

longwrite.sh

#!/bin/sh
#
# Command examples:
# time ./write.sh
# time ./write.sh 1000
#
# This will print time taken (default test, max=100000)
# real  0m1.258s
# user  0m0.816s
# sys   0m0.438s

if [ -z "$1" ]; then
  max=100000
else
  max="$1"
fi

echo "" > myfile.txt
for i in `seq 2 $max`
do
  echo "$i" >> myfile.txt
done