Unix Shell Scripting Tutorial

http://www.tutorialspoint.com/unix/unix-using-variables.htm

if [ "$1" = "cool" ]
then
    echo "Cool Beans"
elif [ "$1" = "neat" ]
then
    echo "Neato cool"
else
    echo "Not Cool Beans"
fi

echo "First Parameter"

NAME[0]="Zara"
NAME[1]="Qadir"
NAME[2]="Mahnaz"
NAME[3]="Ayan"
NAME[4]="Daisy"
echo "First Index: ${NAME[0]}"

val=`expr 2 + 2`
echo "Total value : $val"


for var in word1 word2 ... wordN
do
   Statement(s) to be executed for every word.
done


for var in 0 1 2 3 4 5 6 7 8 9
do
   echo $var
done
http://askubuntu.com/questions/2368/how-do-i-set-up-a-cron-job