i have no understanding of how to write an array or use one, please help!

ETC Homework & Coursework Questions
1

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

  1. The problem statement, all variables and given/known data:
    make 2 files. one to Input 10 numbers and print out the biggest number, and one to Write a script that can check your permission (read/write/execution) on the input filename as the argument.

  2. Relevant commands, code, scripts, algorithms:
    has to be made using arrays and the declare -a command

  3. The attempts at a solution (include all code and scripts):
    i have no understanding i can do it using arguements but not with an array

  4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
    University of michigan, michigan, chang, cse 132

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

2
  1. declare -a [arrayvariablename] is optional, but good practice
    So:
declare -a myarr
# we now have an empty array called myarr
  1. to assign a value to an array element (one of the members of the array:
myarr[13]=4

This now means that the fourteenth (remember we chose to start counting from 0?)
contains 4.

  1. So we want to enter ten numbers right? We need a loop to count from 0 .. 9
for i in 1 2 3 4 5 6 7 8 9
do
  # put your code here
done

i becomes 0 then 1,2,3..... as the loop goes on.

for i in 0 1 2 3 4 5 6 7 8 9
do
    echo -n 'Enter a number: '
    read myarr[$i]   # read lets you type in a number then assign it to a variable
done

You now have 10 array element, each of which has a number in it. Let's find the biggest one.

echo ${myarr[4]}  # NOTE the ${} part -when you want to get the value in an array element

So let us stomp thru the array and assign something to another variable, call it max

max=-2147483647  # I picked a negative number because your prof will do that to test 
# your code
# poor profs love to to go beyond what they tell you.... they think it somehow teaches (IMO)  

for i in 0 1 2 3 4 5 6 7 8 9
do
   [  $max -lt ${myarr ] && max=${myarr}
done

display the result:

echo "maximum value is $max"

Have fun....

PS:

[ $max -lt ${myarr ] && max=${myarr}

is shell shorthand for if [ ] then do something endif.