DO NOT USE: sku cleaning

gistfile1.txt

<?php

namespace ProxiBlue\Shell\Console\Command;

use Magento\Setup\Exception;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Input\InputOption;

class RemoveSkuSpaces extends Command
{

    /**
     * @var CollectionFactory
     */
    private $productCollectionFactory;

    /** @var \Magento\Framework\App\State * */
    private $appState;

    /**
     * @param CollectionFactory $productCollectionFactory
     */
    public function __construct(
        \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $productCollectionFactory,
        \Magento\Framework\App\State $appState
    )
    {
        $this->appState = $appState;
        parent::__construct();
        $this->productCollectionFactory = $productCollectionFactory;
    }

    protected function configure()
    {
        $this->setName('proxiblue-shell:remove-sku-space')
            ->setDescription('Fix product skus that have spaces pre/post fixed');
        parent::configure();
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $output->setDecorated(true);
        $this->appState->setAreaCode(\Magento\Framework\App\Area::AREA_GLOBAL);
        $collection = $this->productCollectionFactory->create();
        foreach ($collection as $item) {
            $output->writeln("--" . $item->getSku() . "--");
            try {
                $item->setSku(trim($item->getSku()))->save();
            } catch (\Exception $e) {
                $output->writeln("=> " . $item->getSku() . " " . $e->getMessage() );
            }
        }
    }

}

DO not use this script it will wipe data. It is now an example of NOT how todo this.

Item is not a fully loaded product
but save operation treats it as a fully loaded product