Add user management

Author: 0x326

CSE 381 (Systems II - OS, Currency, Virtualization, and Security)/Linux User Management/README.md

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+# Linux User Management
+
+## Users
+
+Add user:
+
+    useradd -c "Full Name" username
+
+Add user with custom group and custom default shell:
+
+    useradd -s /bin/sh -g groupname username
+
+Add/change password:
+
+    passwd username
+
+Set expiration date for account:
+
+    usermod -e YYYY-MM-DD username
+
+Set password expiration date:
+
+    chage -l username
+
+Examine hashed password:
+
+    grep username /etc/passwd
+
+Examine properties of user:
+
+    id username
+
+Change user ID:
+
+    usermod -u 1600 username
+
+Move to new group ID:
+
+    usermod -g 999 username
+
+Delete user:
+
+    userdel -r username
+
+## Groups
+
+Create group:
+
+    groupadd groupname
+
+Examine group entry:
+
+    grep groupname /etc/group
+
+Create system group:
+
+    groupadd -r groupname
+
+Change group ID:
+
+    groupmod -g 1600 groupname
+
+Rename group:
+
+    groupmod -n oldgroupname newgroupname
+
+Delete group:
+
+    groupdel groupname