UNIX for Dummies Questions & Answers

I'm trying to learn unix and was going through some problems when I ran into this questiona about creating a script that will caclulae the suam and average of the scores for the assignments and quizzes after it drops the worst one. this tool will manage the data with each own weight and generate a final grade in the letter format. Also provide the option to send the grade report to user by email. an if then else fi command is expected in the script, same as case in esac and for while loop. Unix `trap` function shall be included to demo how it uses it.

And what's ur question?

Im not to sure where I'm even supposed to begin with this program. I am a first time user. trying to try to prorams that I'm trying to understand

Sounds like a homework question...

Take the program in pieces. Start simple

I'm going through a unix book that I bought. But I wanted to know if it was possible to see an example to see it I understand it but I have no clue to where to begin

The best thing to start a script is to tell the shell in which shell the script has to run

#!/usr/bin/bash

and then...

i have that so far this is what i have
#!/usr/bin/ksh
#
#export PATH=/bin:/usr/bin
#
#shell variables
PROG=`basename $0`
#
#OutFile=/tmp/$LOGNAME.$PROG
#
#echo "Hi $LOGNAME:\n\tPlease enter scores of assignments (seperate by 'space'): \c"
read input
echo
#
Counter=0
Total=0
Worst=999
cp/dev/null $OutFile
#
for score in $Input
do
#
case "$score" in
[0-9]|[1-9][0-9]|100)
Counter=`expr $Counter +1`
[$score -it$worst] && Worst=$score
Total=`expr $Total + $score`
echo "\tHw-${Counter}: ${score}, Sum: ${Total}, Worst One: $Worst" | tee-a $OutFile
;;
[0-9]|[1-9][0-9]|100)
echo "\tYou enter <$score> which is greater than 100 ==> no! no!!" >&2
exit 10
;;
*)
echo "\tYou enter <$score> which is not a positve number">&2
exit 20
;;
esac
done
#
echo"
$Counter Assignments Total: ${Total}, Worst: $Worst" | tee-a $OutFile
Conter=`expr $Counter -1`
Total=`expr $Total - $Worst`
Average=`expr $Total/$Counter`
echo"
Average is $Average" | tee-a $OutFile
#
echo "Enter the email id to receive tis report: \c"
read Rcptld
if [-n "Rcptld"]; then
mailx-s "CMP-322 Reportcard" $Rcptld <$OutFile
fi
#
exit 0




but Im still missing the if-then-else-fi command, a case-in-esac, and for/while loop, a trap function, and also a function to check input. And that's what I don't know how to do.