Basic Shell Scripting

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Your student ID number here:

  1. (3 points) Understand what the command expr does. Then write a bash script called interactive-product to read in two numbers, one at a time, and then print their product.

    This script should work as follows:

    [user@host name]$ ./interactive-product
    Please enter the first number:
    Please enter the second number:
    The product is 21.

    Write your script below.

    echo "Please enter the first number:"
    read first
    echo "Please enter the second number:"
    read second
    echo "The product is" `expr $first \* $second`
  2. (3 points) Make three files in your home directory: John.1, John.2 and John.3. Use "vim" to put the name John Donn in the first one, John Smith in the second and Mary Ann in the third. Now write a bash script that searches for "John" in files John.k, where k goes from 1 to 5. Write it below. #!/bin/bash
    for i in `seq 1 5`
      grep "John" John.$i
  3. (4 points) Modify the last bash script from your lecture to print the output line in bold white font on green background. You will find the useful. Write the appropriate echo command below. echo -en "\033[1;37;42m"