Question

Bash script

Suppose you are working as a prof or TA and your students have an assignment which requires them each to hand in exactly one file. You've got a directory with all of the submitted files in it, and no other files. You're also lucky enough to have a script that will do all the work of marking a submission; it will take the name of a submission file as its only parameter and will print out a single upper-case letter (A, B, C, D or F) as its only output.

You'd like to know the distribution of marks in your class. Write a bash script called gradeDist.sh (the ".sh" extension is required!) that will take two parameters:

1. The name of your marking script
2. The name of the folder containing the assignment submission files

Your gradeDist.sh script must call the marking script to mark each file inside the folder and print a report showing the number of files earning each of the letter grades. If there are sub-folders inside the folder, your script must ignore them (and all of the files inside them). The only output of your gradeDist.sh script should be a list of how many submission files received each of the five possible marks.

Answer 1

File: gradeDist.sh

#!/bin/bash

# $1 will have the marking script
MARKING_SCRIPT=$1
# $2 will have the assignment submission folder
ASSIGNMENT_SUBMISSION_FILES_DIR=$2

# Declare variables for maintaining the counts of
# submissions of each grade
SUBMISSIONS_A=0
SUBMISSIONS_B=0
SUBMISSIONS_C=0
SUBMISSIONS_D=0
SUBMISSIONS_F=0

# loop through all the files in the supplied directory
for file in "$ASSIGNMENT_SUBMISSION_FILES_DIR"/*
do
  # check if the current location being looped on 
  # is a file or not. 
  if [ ! -d "$file" ]; then
        # Invoke the supllied grading script to grade the 
        # submission. 
        GRADE=`./$MARKING_SCRIPT $file`

        # As per the grade of the submission increment 
        # the count of the respective grade counts.
        if [[ $GRADE == 'A' ]];then
            SUBMISSIONS_A=$(( SUBMISSIONS_A + 1 ))
        elif [[ $GRADE == 'B' ]];then
            SUBMISSIONS_B=$(( SUBMISSIONS_B + 1 ))
        elif [[ $GRADE == 'C' ]];then
            SUBMISSIONS_C=$(( SUBMISSIONS_C + 1 )) 
        elif [[ $GRADE == 'D' ]];then
            SUBMISSIONS_D=$(( SUBMISSIONS_D + 1 ))
        elif [[ $GRADE == 'F' ]];then
            SUBMISSIONS_F=$((SUBMISSIONS_F+1))
        fi
  fi
done
echo "-----------------------------"
echo "GRADE | NUMBER OF SUBMISSIONS"
echo "-----------------------------"
echo "A     |    $SUBMISSIONS_A"
echo "B     |    $SUBMISSIONS_B"
echo "C     |    $SUBMISSIONS_C"
echo "D     |    $SUBMISSIONS_D"
echo "F     |    $SUBMISSIONS_F"
echo "-----------------------------"

How to run:

./gradeDist.sh {GRADING_SCRIPT} {ASSIGNMENT_DIR}
where GRADING_SCRIPT is the script that is used to grade the grade the submissions
and ASSIGNMENT_DIR is the directory where the assigments are there.

Example: ./gradeDist.sh test.sh folder

To test the script
1. I wrote a grading file that would randomly grade the file (test.sh):

#!/bin/bash
RANDOM_NUM=$RANDOM
RANDOM_NUM=$((RANDOM%5))
if [[ $RANDOM_NUM == 0 ]]; then
echo 'A'
elif [[ $RANDOM_NUM == 1 ]]; then
echo 'B'
elif [[ $RANDOM_NUM == 2 ]]; then
echo 'C'
elif [[ $RANDOM_NUM == 3 ]]; then
echo 'D'
elif [[ $RANDOM_NUM == 4 ]]; then
echo 'F'
fi

2. I created a folder named "folder" with random files

3. Then I ran ./gradeDist.sh test.sh folder

Output of the script :

akashpanda@DESKTOP-J1T11IR:/$ ./gradeDist.sh test.sh folder/
-----------------------------
GRADE | NUMBER OF SUBMISSIONS
-----------------------------
A     |    2
B     |    4
C     |    2
D     |    2
F     |    4
-----------------------------