Updates product prices via WP CLI script.

update-product-prices.php

<?php
/**
 * Updates product prices.
 * More about WP CLI scripts:
 * https://wptheming.com/2021/05/wp-cli-scripts-and-woocommerce/
 *
 * wp eval-file update-product-prices.php
 */

$products = get_posts([
    'post_type'      => [ 'product' ],
    'posts_per_page' => -1,
    'fields'         => 'ids',
]);

// Amount of price change.
$price_change = 1.00;

// Headers to log in csv output.
$headers = [ 'id', 'title', 'original price', 'updated price' ];
log_data( $headers );

// Output for terminal.
$output = array();

WP_CLI::log( "" );
$progress = \WP_CLI\Utils\make_progress_bar( 'Updating prices', count( $products ) );

foreach ( $products as $product_id ) {
    $data = [];
    $product = wc_get_product( $product_id );

    $original_price = $product->get_regular_price();
    $updated_price = $original_price + $price_change;
    $product->set_regular_price( $updated_price );
    $product->save();

    $data['id'] = $product_id;
    $data['title'] = $product->get_title();
    $data['original price'] = wc_format_decimal( $original_price, 2);
    $data['updated price'] = wc_format_decimal( $updated_price, 2);

    $output[] = $data;

    log_data( $data );
    $progress->tick();
}

$progress->finish();

WP_CLI::log( "" );
\WP_CLI\Utils\format_items( 'table', $output, $headers );
WP_CLI::log( "" );

function log_data( $output ) {
    $file_name = 'export-data.csv';
    $file_resource = fopen( $file_name, 'a' );
    fputcsv( $file_resource, $output );
    fclose( $file_resource );
}