Shell Programming and Scripting

Hello all.

I have a script that uses two arrays in the beginning. Saves certain values that i am extracting from df -h command.
array1[i] and array2[i] where i is from 0 to 9.

It then goes on and saves the values of the arrays into variables.

for i 0 to 9 , tmp= array2[i] // I am no writing the exact syntax here. just telling u my idea.

No I want the script to run again , get the latest results into my arrays and compare them with the values I had the last time saved in tmp. Will my previous values been in tmp variables? Im not sure on how memory management works in unix.

thanks

A "shell" is a program like any. A "shell script" is a text file with commands the shell program can read, understand and execute.

Memory management in Unix is equal to all the other OSes out there insofar as programs which end release their memory back to the OS. If every invocation of a software would come up in the same status it had when it ended a program crashing could never be restarted because it would come up in the same crashed state as it exited, no?

If you want to maintain your values write them down to a file and test for the existence of this file upon startup and fill your arrays from reading this file if it exists.

I hope this helps.

bakunin

if you don't have any problem create another array.
because saving in temp variable, it saves only one value as per your variable assignment.

try something like this..

Code:

for i in {1..5}
do
temp[$i]=${array2[$i]}
done

then you can compare those with new value of arrays..

Thanks. Will the values in temp array be stored once I run the script again ?

I think bakunin already answered your question..

that is better one. it doesn't impact your session expiry's and all. it can be worked even in another session and from another machine...

As my knowledge... shell variables and array are present till the session exists and for that session only.....

Hope this helps you..