Shell Programming and Scripting

#!/bin/bash

a[i]=0; b[i]=0; g[i]=0; w[i]=0;
echo "Enter Number of Processes:"
read n

echo "Enter Burst Time:"
for (( i=0; i<n; i++ ))
do
read b[i]
done

echo "Enter Arrival Time:"
for (( i=0; i<n; i++ ))
do
read a[i]
done

g[0]=0
for (( i=0; i<n; i++ ))
do
w[i]=g-a[i]
t[i]=g+1-a[i]
awt=awt+w[i]
at=at+t[i]
done

awt=awt/n
at=at/n

echo " Waiting time:"
for (( i=0; i<n; i++ ))
do
echo $w[i]
done

echo "Turnaround time:"
for (( i=0; i<n; i++ ))
do
echo $t[i]
done

echo " The average waiting time is ",$awt
echo " The average turnaround time is ",$at

#!/bin/bash

# what is i supposed to be here?  zero?
i=0
a[$i]=0; b[$i]=0; g[$i]=0; w[$i]=0;
echo "Enter Number of Processes:"
read n

echo "Enter Burst Time:"
for (( i=0; i<n; i++ ))
do
        read b[$i]
done

echo "Enter Arrival Time:"
for (( i=0; i<n; i++ ))
do
        read a[$i]
done

g[0]=0
for (( i=0; i<n; i++ ))
do
        # Expressions don't work that way in BASH.
        #w[i]=g-a[i]
        #t[i]=g+1-a[i]
        #awt=awt+w[i]
        #at=at+t[i]
        # Is this a[1] supposed to be a[i] ?
        ((w[i]=g+1-a[1]))
        ((t[i]=g+1-a[i]))
        ((awt=awt+w[i]))
        ((at=at+t[i]))
done

# Beware that BASH only supports integers!
# You won't get decimal points here.
((awt=awt/n))
((at=at/n))

# You don't need to loop through an array to print it.
# echo " Waiting time:"
#for (( i=0; i<n; i++ ))
#do
#        echo $w[i]
#done
echo "Waiting time:  ${w[*]}"

#echo "Turnaround time:"
#for (( i=0; i<n; i++ ))
#do
#echo $t[i]
#done

echo "Turnaround time: ${t[*]}"

# You don't need , to separate arguments in shell.
# you can put arguments right inside strings, too.
#echo " The average waiting time is ",$awt
#echo " The average turnaround time is ",$at
echo "The average waiting time is $awt"
echo "The average turnaround time is $at"

#!/bin/bash
i=0
a[$i]=0; b[$i]=0; g[$i]=0; w[$i]=0;

echo "Enter Number of Processes:"
read n

echo "Enter Burst Time:"
for (( i=0; i<n; i++ ))
do
read b[$i]
done

echo "Enter Arrival Time:"
for (( i=0; i<n; i++ ))
do
read a[$i]
done

g[0]=0
for (( i=0; i<n; i++ ))
do
((w[i]=g[i]-a[i]))
((t[i]=g[i+1]-a[i]))
((awt=awt+w[i]))
((at=at+t[i]))
done

((awt=awt/n))
((at=at/n))
echo " The waiting time is ${w[*]}"
echo " The turnaround time is ${t[*]}"
echo " The Average waiting time is $awt"
echo " The Average Turnaround time is $at"