Added useradd.md with most relevant use cases

pages/common/useradd.md

@@ -0,0 +1,19 @@
+# useradd
+
+> Create a new user
+
+- Create new user
+
+ `useradd {{name}}`
+
+- Create new user with a default home directory
+
+ `useradd -m {{name}}`
+
+- Create new user with specified shell
+
+ `useradd -s {{/path/to/shell}} {{name}}`
+
+- Create new user with supplementary groups (mind the lack of whitespace)
+
+ `useradd -G {{group1,group2}} {{name}}`