Commands

List services by boot time to identify slow starters.

Inspect the boot dependency chain that delays login.

Show failed systemd units before tuning healthy services.

Read error-priority messages from the current boot.

Check filesystem capacity in human-readable units.

Measure individual log directories before cleanup.

Find deleted files that running processes still hold open.

Show interfaces and assigned addresses in brief form.

Show the active routing table and default gateway.

Test a Netplan change with automatic rollback protection.

Apply a verified Netplan configuration.

Verify hostname resolution through the system resolver.

Confirm that WireGuard tools are installed.

Inspect a running WireGuard interface and its peers.

Start a WireGuard interface and enable it for future boots.

Generate a modern SSH key pair before adding a public-key comment.

Install the current public key for a remote server account.

Test that a server accepts key-only authentication.

Review the firewall state, rules, and default policies.

Allow SSH before enabling a server firewall.

List firewall rules with numbers for precise review.

Add Flathub without duplicating an existing remote.

Search Flathub from the terminal.

Update installed Flatpak apps and runtimes.

List installed Flatpak applications.

Check Docker service status without opening a pager.

Print the installed Docker Engine version.

Confirm the installed Compose plugin version.

Start a Compose stack in the background.

Stop and remove a Compose stack after testing.