How to use dumpe2fs in script

[joneall]

I am trying to write a perl program to check on various partition parameters. I use the dumpe2fs command as follows:

#!/usr/bin/perl

$cmd =
sprintf( "sudo dumpe2fs -h %s | grep -i \'mount count\' 2>/dev/null" , "/dev/sda6");

@res = `$cmd`;

exit;

The darn thing ALWAYS prints out the header line:

$ dumpe2fs-what.pl
dumpe2fs 1.42.5 (29-Jul-2012)

This completely messes up the output from my perl program. Is there no way to shut the thing up? Or am I confused again.

[kubicle]

If you wish to suppress STDERR output for the dumpe2fs command, you'll want to put the redirection before the pipe (simplified the command for clarity, add the bits to make it complete):
dumpe2fs 2>/dev/null | grep

Alternatively you could send STDERR to STDOUT and let grep weed it out:
dumpe2fs 2>&1 | grep

[joneall]

Of course. Thank you.