Fix invalid bash for loop in catalog image resizing "The faster way" example

[snowcore]

Description

The code snippet under “The faster way” in the Catalog image resizing documentation contains invalid bash syntax and fails with a parse error.

Doc page: https://experienceleague.adobe.com/en/docs/commerce-operations/implementation-playbook/best-practices/development/catalog-image-resizing#the-faster-way

Current snippet (as published):

for i in {1.."$((2 * `nproc --all`))"};do bin/magento queue:consumers:start media.storage.catalog.image.resize &;done;

When executed in bash, it errors:

bash: syntax error near unexpected token `;'

Steps to reproduce

• Open the doc page linked above and copy the snippet from the “The faster way” section
• Paste it into a bash shell on a machine with nproc available (Linux) and Magento’s bin/magento present
• Run the command

Expected result

The snippet should be valid bash and start (2 * number_of_CPUs) consumer processes for media.storage.catalog.image.resize without a syntax error.

Possible solutions

Replace the snippet with a valid loop. For example:

for i in $(seq 1 "$((2 * $(nproc --all)))"); do
  bin/magento queue:consumers:start media.storage.catalog.image.resize &
done

This uses seq for the range and uses $(...) command substitution consistently.

Additional information

The current snippet mixes brace expansion with a quoted arithmetic expansion (and backticks) in a way that doesn’t form a valid list for for i in ....

Tested in bash; the published one-liner fails to parse before it can run any Magento commands.