Shell Programming and Scripting

Hi,

I have to perform the two things;

a) Have to check the previous counter value in the file.
b) After some processess are runned again i have to check the same counter value in the same file.

Here is the file contents.

Code:

#File contents of file.txt
CounterValue: 0

Here is the code.

Code:

open(FH,"file.txt");
@lines=<FH>;
foreach($lines)
{
	if($_=~/CounterValue:\s+(\d+)/)
	{
		print "\nCounter value is: $1 \n";
		$previous=$1;
		last;
	}
	
}
print "\nPrevious value of counter: $previous \n";

Some other process will run and the file.txt gets changed to the new value.

Now contents of file are:

Code:

CounterValue: 1

The Output should be:

Code:

The previous value of counter: 0
The latest value of counter: 1

I am having the problem here because when the program is run the file.txt contents is replaced again the previous and new value will be 1.

How can i check the previous and new value of counter in the file?

Should i use the same code for new and previous values?

How do i get the above output?

Regards
vanitha

Seems like a pretty straightforward case. You have the script X to capture the "Counter Value" from the file.

1) Run the script X and capture the (old) "Counter Value".
2) Run the processes that update your file.
3) Run the script X again, and capture the (new) "Counter Value".

tyler_durden

Hi,

Thanks for your mail.

The code above posted can i use that.

But the file when reopen is giving new as well as old value same.

Can you give an example?

Regards