Update cheatsheets

linux/useradd

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# useradd
+
+> Create a new user.
+> See also: `users`, `userdel`, `usermod`.
+> More information: <https://manned.org/useradd>.
+
+- Create a new user:
+
+`sudo useradd {{username}}`
+
+- Create a new user with the specified user id:
+
+`sudo useradd --uid {{id}} {{username}}`
+
+- Create a new user with the specified shell:
+
+`sudo useradd --shell {{path/to/shell}} {{username}}`
+
+- Create a new user belonging to additional groups (mind the lack of whitespace):
+
+`sudo useradd --groups {{group1,group2,...}} {{username}}`
+
+- Create a new user with the default home directory:
+
+`sudo useradd --create-home {{username}}`
+
+- Create a new user with the home directory filled by template directory files:
+
+`sudo useradd --skel {{path/to/template_directory}} --create-home {{username}}`
+
+- Create a new system user without the home directory:
+
+`sudo useradd --system {{username}}`