systemctl-list-dependencies

Show default.target dependencies

$ systemctl list-dependencies

$ systemctl list-dependencies [unit]

$ systemctl list-dependencies [unit] -a

$ systemctl list-dependencies [unit] -t [service|socket|target|mount]

$ systemctl list-dependencies [unit] --reverse

$ systemctl list-dependencies [unit] --no-legend

systemctl list-dependencies [OPTIONS] [UNIT...]

systemctl list-dependencies displays a unit's dependency tree in a hierarchical format. By default, it shows Requires and Wants dependencies. With `--all`, it includes all dependency types (After, Before, Conflicts, etc.).
The `--reverse` option inverts the view, showing which units depend on the specified unit rather than what it depends on.

-a, --all

Include all dependency types (not just Requires and Wants)

Filter by unit type

Show units that depend on this unit instead

Suppress header and footer (for scripts)

Disable pager

The tree can be very large for targets like default.target. Active units are marked differently from inactive ones. The output represents configuration, not runtime state.

The list-dependencies subcommand helps understand the complex dependency relationships in systemd, essential for debugging boot issues and understanding service ordering.

systemctl(1), systemctl-list-units(1), systemd.unit(5)