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Certainly! Here's a comprehensive overview and summary of each systemd- tool:
1. `systemd-analyze`: A tool for analyzing and optimizing system boot-up performance. It can show timing details, critical chains, and generate SVG plots of the boot process.
2. `systemd-ask-password`: Queries the user for a system passphrase, such as for encrypted volumes or SSL certificates, during system boot or runtime.
3. `systemd-cat`: Connects the standard input and output of a process to the system journal, allowing you to capture and view the output of a command or script in the systemd journal.
4. `systemd-cgls`: Recursively shows the control group (cgroup) hierarchy in a tree-like format, displaying the processes and their associated resources.
5. `systemd-cgtop`: Provides a real-time, top-like interface for monitoring control group (cgroup) resource usage, helping identify processes consuming excessive resources.
6. `systemd-creds`: Displays and processes credentials passed to the system from the kernel command line or through the `systemd-run` tool.
7. `systemd-cryptenroll`: Allows enrolling encrypted devices such as TPM2 security devices or PKCS#11 tokens into the system and managing their authentication.
8. `systemd-delta`: Compares the current state of systemd units to their default configuration files, identifying any overrides or modifications.
9. `systemd-detect-virt`: Detects whether the system is running in a virtual machine or container environment.
10. `systemd-escape`: Escapes strings for usage in systemd unit names, making them suitable for use as a filename or argument.
11. `systemd-firstboot`: Initializes basic system settings such as locale, time zone, and root password during the first boot of a newly installed system.
12. `systemd-hwdb`: Manages the hardware database, which contains key-value pairs of hardware-specific quirks and configurations.
13. `systemd-id128`: Generates and prints 128-bit IDs, which are used for identifying various objects and entities in systemd.
14. `systemd-inhibit`: Executes a program while inhibiting certain system-wide actions, such as screen blanking, system sleep, or idle mode.
15. `systemd-machine-id-setup`: Generates a unique machine ID for the system, which is used to identify the host in various contexts.
16. `systemd-mount`: Establishes and destroys transient mount points from the command line or in system units.
17. `systemd-notify`: Allows a service to send notification messages to systemd about its state changes.
18. `systemd-path`: Converts file system paths to systemd unit names and vice versa.
19. `systemd-repart`: Automatically grows and adds partitions to a partition table, based on configurable rules.
20. `systemd-run`: Runs a command as a systemd service or scope unit, managing its lifecycle and resource consumption.
21. `systemd-socket-activate`: Runs a socket-activated command, allowing on-demand activation of services based on incoming socket connections.
22. `systemd-stdio-bridge`: Bidirectionally connects the standard input/output/error of a process to a socket, enabling communication with systemd.
23. `systemd-sysext`: Activates, deactivates, and lists system extension images, which are used for extending the system's root directory.
24. `systemd-sysusers`: Creates and manages system users and groups based on declarative configuration files.
25. `systemd-tmpfiles`: Manages the creation, deletion, and cleanup of temporary and volatile files and directories.
26. `systemd-tty-ask-password-agent`: Queries the user for system passphrases through a TTY or terminal.
27. `systemd-umount`: Unmounts mount points, including transient ones, in a controlled and safe manner.
These tools provide a wide range of functionality for system management, service control, resource monitoring, and configuration in a systemd-based environment. They help in analyzing and optimizing system performance, managing system users and groups, handling hardware quirks, and much more.