Question

Write a Bash shell script testaverager.sh that will determine if a person has passed a class. It should take in as a command-line parameter a name (first and last name) as well as a series of numbers. This list could be of any length. Your script should start by calculating the average of the scores. If the result is below 70, it should output “Sorry [name] but you will have to retake the class!”. If the result is 70 or greater, congratulation the student with some message about succeeding at the class

Answer 1

Program

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cat testavaerager.sh
#!/bin/bash

#regular expression to test if variable is number
re='^[0-9]+$'

#loop for reading command line arguments which is a number
for var in "$@"
do
if [[ $var =~ $re ]] ; then
sum=$((sum + var))
count=$((count+1))
fi
done

#calculating the precentage
per=`expr $sum / $count`

#displaying the percentage
echo "Percentage: " $per

#verifying if it is less than 70 or not
if [ $per -lt 70 ]
then
echo "Sorry $1 $2 but you will have to retake the class!"
else
echo "Congatulations $1 $2 you passed the class"
fi

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Output

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root:~ # sh testavaerager.sh Mike kelly 60 70 90 50 94
Percentage: 72
Congatulations Mike kelly you passed the class

root:~ # sh testavaerager.sh Bill Harry 34 56 89 12 34 56 67
Percentage: 49
Sorry Bill Harry but you will have to retake the class!

Answer 2

Here's an example of a Bash shell script named "testaverager.sh" that calculates the average of scores and determines if a person has passed a class:

bashCopy code#!/bin/bash# Check if the number of command-line arguments is less than 2if [ $# -lt 2 ]; then
  echo "Usage: $0 <name> <score1> <score2> ..."
  exit 1fi# Extract the name from the command-line argumentsname=$1shift# Calculate the average of scoressum=0
count=0for score in "$@"; do
  sum=$((sum + score))
  count=$((count + 1))doneaverage=$((sum / count))# Check if the average is below 70if [ $average -lt 70 ]; then
  echo "Sorry $name, but you will have to retake the class!"else
  echo "Congratulations $name! You have succeeded in the class."fi

To use this script, save it to a file (e.g., testaverager.sh), make it executable (chmod +x testaverager.sh), and then run it with the desired name and scores as command-line arguments. For example:

rubyCopy code$ ./testaverager.sh John Doe 80 75 85 90Congratulations John Doe! You have succeeded in the class.

rubyCopy code$ ./testaverager.sh Jane Smith 60 65 55Sorry Jane Smith, but you will have to retake the class!

Make sure to replace the score values with the actual scores for accurate calculations.