Update cheatsheets

tldr/linux/systemctl-add-wants

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl add-wants
+
+> Add `Wants` dependencies to a target for one or more units.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html#add-wants%20TARGET%0A%20%20%20%20%20%20%20%20%20%20UNIT%E2%80%A6>.
+
+- Add a `Wants` dependency from a target to a unit:
+
+`systemctl add-wants {{target}} {{unit}}`
+
+- Add multiple `Wants` dependencies at once:
+
+`systemctl add-wants {{target}} {{unit1 unit2 ...}}`
+
+- Add a user-level `Wants` dependency:
+
+`systemctl --user add-wants {{target}} {{unit}}`