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$msb->write_to('check_slaves', '>>', 'for NNUM in ' . $slave_list );
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$msb->write_to('check_slaves', '>>', 'do' );
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$msb->write_to('check_slaves', '>>', ' echo "slave # $NNUM"');
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. " 'show slave status\\G' | grep Running" );
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$msb->write_to('check_slaves', '>>', 'done ' );
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chmod 0755, 'check_slaves';