Update cheatsheets

linux/systemd-sysusers

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemd-sysusers
+
+> Create system users and groups.
+> If the config file is not specified, files in the `sysusers.d` directories are used.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemd-sysusers.html>.
+
+- Create users and groups from a specific configuration file:
+
+`systemd-sysusers {{path/to/file}}`
+
+- Process configuration files and print what would be done without actually doing anything:
+
+`systemd-sysusers --dry-run {{path/to/file}}`
+
+- Print the contents of all configuration files (before each file, its name is printed as a comment):
+
+`systemd-sysusers --cat-config`