Shell Programming and Scripting

#/bin/sh

check(){
    if [ -z "$1" ];
  then echo "No user input";
exit;fi
       }

check $1




sum=0
n=0 
for i in $*
do
echo $i
    if [ -f $i ]
    then
        while read line        
        do
  n=` expr $n + 1 `
           sum=` expr $sum + $line `
                         done < $i

        else
           sum=` expr $sum + $i `
         n=` expr $n + 1 `
           fi


         done

 average=$(echo "scale=3; $sum/$n" | bc -l )
        #  average=` expr $sum / $n `
          echo $average

echo scale=2";" "(" $(cat file{1..2}|tr -s ' \n' '+') "0)" / $(cat file{1..2}|wc -w) | bc
5.87

check(){
    if [ -z "$1" ];
  then echo "No user input";
exit;fi
       }

check $1
sum=0
n=0
t=0
for i in $*
do
          if [ -f $i ]
                  then
                  while read line
                        do
                       for j in $line
                                do

                           n=` expr $n + 1 `
                           sum=` expr $sum + $j `
                                        done
                                        done< $i
           else
                    sum=` expr $sum + $i `
                    n=` expr $n + 1 `
           fi

          done


         average=$(echo "scale=2; $sum/$n" | bc -l )
        # average=` expr $sum / $n `
         echo $average

#!/bin/ksh
n=0                                             # initialize number of numbers
sum=0                                           # initialize sum of numbers
if [ $# -gt 0 ]
then    for i in $*                             # Process command line args
        do      if [ -f $i ]
                then    while read line         # read from file named by arg
                        do      for j in $line  # for each number on the line
                                do      ((n++)) # increment count and update sum
                                        ((sum += j))
                                done
                        done < $i
                else    ((sum += i))            # process command line number
                        ((n++))
                fi
        done
else    while read line                         # Process numbers from stdin
        do      for j in $line
                do      ((n++))
                        ((sum += j))
                done
        done
fi
average=$(( (sum + 0.0) / n))                   # calculate average
printf "%.2f\n" $average                        # round to 2 decimal places