systemctl list-dependencies: add page

pages/linux/systemctl-list-dependencies.md

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+# systemctl list-dependencies
+
+> Show a unit's dependency tree in systemd.
+> See also: `systemctl list-units` to list loaded units.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#%0A%20%20%20%20%20%20%20%20%20%20%20%20list-dependencies%0A%20%20%20%20%20%20%20%20%20%20%20%20UNIT...%0A%20%20%20%20%20%20%20%20%20%20>.
+
+- Show the dependency tree of `default.target`:
+
+`systemctl list-dependencies`
+
+- Show the dependency tree of a specific unit:
+
+`systemctl list-dependencies {{unit}}`
+
+- Include all dependency types (not only `Requires=` and `Wants=`):
+
+`systemctl list-dependencies {{unit}} {{[-a|--all]}}`
+
+- Limit the tree to a specific unit type:
+
+`systemctl list-dependencies {{unit}} {{[-t|--type]}} {{service|socket|target|mount|...}}`
+
+- Reverse the direction to show units that depend on the specified unit:
+
+`systemctl list-dependencies {{unit}} --reverse`
+
+- Print output without headers or footers (for scripts):
+
+`systemctl list-dependencies {{unit}} --no-legend`