Hosting Operations
Read-only, can be slowCreate a SHA256 Checksum Manifest
You need checksums for key files before copying or archiving them.
Command
sha256sum source/app/config.yml source/content/index.md source/content/about.md source/assets/logo.svgBefore 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 paste checksum output containing sensitive filenames into public logs without review.
Expected output
SHA256 hashes followed by file paths.
System impact
Read-only, can be slow. Nothing changes. The command calculates SHA256 hashes and prints them.
Scope this to the smallest useful path or service on busy systems.
Recovery / rollback: no state is changed.
When to use it
Use before a backup, migration, or manual copy when byte-level verification matters.
When not to use it
Do not paste checksum output containing sensitive filenames into public logs without review.
next steps
Related commands
Restore One File From Last Good Release
Recover a config file without rolling back the whole branch.
git restore --source=release-2026-06-25-1000 -- app/config.yml
Verify Restored File Checksums
A restore is not validated until the bytes match.
BACKUP_ROOT=/srv/backups/site RESTORE_SANDBOX=/tmp/linuxoneliners-restore/full && rm -rf "$RESTORE_SANDBOX" && mkdir -p "$RESTORE_SANDBOX" && tar -xf "$BACKUP_ROOT/2026-06-25/site.tar" -C "$RESTORE_SANDBOX" && (cd "$RESTORE_SANDBOX" && sha256sum -c CHECKSUMS.sha256)
Verify a SHA256 Checksum Manifest
A checksum file is only useful if you actually verify it.
sha256sum -c checksums.sha256
Diff Restored Config Against Expected
A restored config can exist and still be the wrong config.
BACKUP_ROOT=/srv/backups/site EXPECTED_CONFIG=/srv/backups/site/expected/app/config.yml RESTORE_SANDBOX=/tmp/linuxoneliners-restore/full && rm -rf "$RESTORE_SANDBOX" && mkdir -p "$RESTORE_SANDBOX" && tar -xf "$BACKUP_ROOT/2026-06-25/site.tar" -C "$RESTORE_SANDBOX" && diff -u "$EXPECTED_CONFIG" "$RESTORE_SANDBOX/app/config.yml"
Compare Artifact Checksums
Verify two artifact copies match before blaming deployment code.
sha256sum artifacts/app.tar.gz releases/current/app.tar.gz
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.
Independent study support only. No affiliation, endorsement, exam dumps, or real exam questions.