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Hosting Operations

Read-only

Preview the Patch a Rollback Would Apply

You know the last good release tag, but you want to inspect what a rollback would remove before changing anything.

Command

git diff --stat HEAD..release-2026-06-25-1000

Before you run this

System impact: Read-only. Low when scoped to the shown target.

When not to use it: Do not treat a small diff as automatically safe; migrations, config, and external state still need review.

Expected output

A diffstat showing the config, migration, public page, and release metadata changes that rollback would remove.

System impact

Read-only. Nothing changes. Git prints the patch summary from the current commit back to the last good release.

Recovery / rollback: no state is changed.

When to use it

Use before reset, revert, or deploy rollback when you need a quick preview of the files and line counts involved.

When not to use it

Do not treat a small diff as automatically safe; migrations, config, and external state still need review.

next steps

Related commands

Hosting Operations Read-only

Revert the Suspect Release Commit

Undo a bad release with a new commit instead of rewriting history.

git restore -- app/config.yml && git revert --no-edit release-2026-06-25-1030
Hosting Operations Read-only

Map Recent Release Commits

A rollback is easier when the last few release tags are visible.

git log --oneline --decorate --graph --all -8
Hosting Operations Can be slow

Find the Processes Burning CPU

A server feels slow, but you need proof before restarting anything.

ps -eo pid,ppid,stat,pcpu,pmem,comm,args --sort=-pcpu | head -n 10
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.