my $file = "/mnt/adtest/qa1/file1";
    my $writeline = "# $test->{currentuser} wrote timestamp " . time();
    my $command = "echo $writeline >> $file";
    my $output = `$command 2>&1`;


##</code><code>##

[root@qanode1-2 latest]# echo "qauser1 wrote timestamp 1414118740-1" >> /mnt/adtest/qa1/file1
-bash: /mnt/adtest/qa1/file1: Permission denied