#!/bin/bash -e
# -e Exit immediately if a command exits with a non-zero status.

# Command line parameters
COURSE=$1 
ASSIGNMENT=$2
STUDENTS=$3

usage()
{
  echo "usage: $0 COURSE ASSIGNMENT STUDENTS"
  echo " e.g.: $0 cs180 2 student-list.txt"
}

# Need 3 parameters
if [[ $# != "3" ]]; then
  echo "Not enough parameters. (Requires 3 parameters)"
  usage
  exit
fi

# Make sure student list exists
if [[ ! -e $STUDENTS ]]; then
  echo "Requires name of file with student logins"
  usage
  exit
fi

logincount=0
zipcount=0

# Read student logins from text file
# e.g. "Doe, John",j.doe ==> j.doe
while read line 
do 
  user=$(echo "$line" | cut -d\" -f3 | cut -d\, -f2,3) 
  logins[$logincount]=$user
  ((logincount = logincount + 1))
done < $STUDENTS

# Get all of the existing zip file names
for z in *.zip
do
  zipfiles[$zipcount]=$z
  ((zipcount = zipcount + 1))
done

# Compare list of student logins with zip files
# This checks for missing zip files (i.e. student didn't submit)
for lg in ${logins[@]}
do
  file=$COURSE"_"$lg"_"$ASSIGNMENT".zip" 
  properzipfiles[$a]=$file
  ((a = a + 1))
  if [[ ! -e $file ]]; then
    echo "   Not found: $file"
  fi
done

# Check for unknown zip names, e.g. j.doe_cs180_1.zip
# Compare actual zip files with expected zip files.
for z in ${zipfiles[*]}
do
  found=0
  for pz in ${properzipfiles[*]}
  do
    if [[ $pz == $z ]]; then
      found=1  # zip file is expected
      break;
    fi
  done
  if [[ $found != "1" ]]; then
    echo "Unknown file: $z"  # zip file is probably named incorrectly
  fi
done

"Smith, John",j.smith
"Doe, Jane",jane.doe

./checkzips

Not enough parameters. (Requires 3 parameters)
usage: ./checkzips COURSE ASSIGNMENT STUDENTS
 e.g.: ./checkzips cs180 2 student-list.txt