"..does not give me the entire elements in the array..it jus gives me the last hash in the array.."

Well, that's because you clobber the %alarm_details hash on each iteration.

Personally, I think you could do away with the @alarm_details array altogether and just use a HoH. Also, I'd go for a split rather than using a regexp, and split the lines directly into named variables. Something like this (untested):

my %alarm_details;
my @files = </TELECOM_PROJ_MAIN/sas/tmp/t*>;

foreach my $file (@files) {
    open LOG, "<", $path or die "Can't open $file:$!\n";
    $alarm_details{filepath} = $file;

    while (<LOG>) {
        chomp;
        my ($key, $value) = split /=/, $_;
        $alarm_details{filepath}{$key} = $value if ($key);
    }
    close LOG;
}
[download]

Also note that I changed @paths to @files, which seems to be more appropriate. And, the 3 argument form of open is better practise, as is checking $! upon failure.

One more thing to note is that the above code would throw "uninitialised value" warnings on any lines that had no data to the right-side of the equals (=). But you could get rid of that by explictitly checking for both $key and $value on each iteration.

Hope this helps,
Darren :)