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Linux Survival Basics

Read-only, can be slow

List URLs from a Sitemap

You need to inspect the loc entries inside a sitemap without opening an XML viewer.

Command

grep -o '<loc>[^<]*</loc>' public/sitemap.xml | sed 's#<loc>##;s#</loc>##'

Before you run this

System impact: Read-only. Can create load on large logs, directories, filesystems, or process tables.

When not to use it: Do not use it as an XML validator; it is a quick inspection command.

Expected output

One sitemap URL per line.

System impact

Read-only, can be slow. Nothing changes. The command extracts URL text from sitemap loc elements.

Scope this to the smallest useful path or service on busy systems.

Recovery / rollback: no state is changed.

When to use it

Use when checking sitemap contents during static-site deploys.

When not to use it

Do not use it as an XML validator; it is a quick inspection command.

next steps

Related commands

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Find Feed Links Missing from the Sitemap

Your feed can advertise URLs that the sitemap never lists.

grep -o '<link>https://example.com/[^<]*</link>' public/feed.xml | sed 's#<link>##;s#</link>##' | while read -r url; do grep -q "$url" public/sitemap.xml || echo "$url"; done
Hosting Operations Can be slow

Find HTML Pages Missing from the Sitemap

A page can exist in the build but never make it into the sitemap.

find public -name '*.html' -print | sed 's#^public#https://example.com#' | while read -r url; do grep -q "$url" public/sitemap.xml || echo "$url"; done
Linux Survival Basics Can be slow

Find the Exact Log Line Before You Scroll

The error was there. The useful part was knowing exactly where it was.

grep -inE 'error|failed|denied|timeout' /var/log/nginx/error.log
Linux Survival Basics Can be slow

Find Nginx root alias and access rules

One deny or alias can explain the whole 403.

grep -RInE 'root|alias|deny|allow' /etc/nginx/sites-enabled /etc/nginx/conf.d 2>/dev/null
Study mapping

Use this as independent command practice: read the notes, predict the output, then compare it with the example before using a real shell.

  • LPIC-1 style command-line practice
  • LFCS style performance-task practice
  • Linux+ style troubleshooting review

Independent study support only. No affiliation, endorsement, exam dumps, or real exam questions.