I second the use of bash-es PIPESTATUS, I've used it in code like this:
my %cmds = ( 'bash' => '/usr/local/bin/bash',
'gzip' => '/usr/bin/gzip',
'lzop' => '/usr/bin/lzop',
'wc' => '/usr/bin/wc' );
my @zip_results = `$cmds{'bash'} -c '$cmds{$compress} -dc $file | $cmds{'wc'} -c ; echo \${PIPESTATUS\@}'`;
The last line of @zip_results has the status of both the 'compress' command and the 'wc' command.
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