Update cheatsheets

linux/usermod

@@ -0,0 +1,30 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# usermod
+
+> Modifies a user account.
+> See also: `users`, `useradd`, `userdel`.
+> More information: <https://manned.org/usermod>.
+
+- Change a username:
+
+`sudo usermod --login {{new_username}} {{username}}`
+
+- Change a user id:
+
+`sudo usermod --uid {{id}} {{username}}`
+
+- Change a user shell:
+
+`sudo usermod --shell {{path/to/shell}} {{username}}`
+
+- Add a user to supplementary groups (mind the lack of whitespace):
+
+`sudo usermod --append --groups {{group1,group2,...}} {{username}}`
+
+- Change a user home directory:
+
+`sudo usermod --move-home --home {{path/to/new_home}} {{username}}`