Question

I need help to

(let <arithmetic expression>)

(expr item1 operator item2)

$(( expression ))

(${#variable})

Create a simple script which will take two command line arguments and then multiply them together using each of the methods detailed above.

These are the methods detailed above

Write a Bash script which will print tomorrows date. (Hint: use the command date)

Remember when we looked at variables we discovered $RANDOM will return a random number. This number is between 0 and 32767 which is not always the most useful. Let's write a script which will use this variable and some arithmetic (hint: play with modulus) to return a random number between 0 and 100.

Answer 1

• script to take two command-line arguments and then multiply them together.

            a=$1 (retrieving 1st no from command-line)
            b=$2 (retrieving 2nd no from command-line)
            echo "sum = `expr $a \* $b`"

         Output: bash ex.sh 2 3
                      sum = 6

• script which will print tomorrow's date.

     $ date --date="next day"

• script to return a random number between 0 and 100.(If we want to limit random number to a certain maximum, we can just compare against the modulus of that maximum + 1 i.e. ). For example, the following will yield results between 0 and 9: echo $(($RANDOM % 101))