Update cheatsheets

linux/userdbctl

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# userdbctl
+
+> Inspect users, groups and group memberships on the system.
+> More information: <https://www.freedesktop.org/software/systemd/man/userdbctl.html>.
+
+- List all known user records:
+
+`userdbctl user`
+
+- Show details of a specific user:
+
+`userdbctl user {{username}}`
+
+- List all known groups:
+
+`userdbctl group`
+
+- Show details of a specific group:
+
+`userdbctl group {{groupname}}`
+
+- List all services currently providing user/group definitions to the system:
+
+`userdbctl services`