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tech:linux:commands_to_add_users_and_groups [2019/12/07 06:27] |
tech:linux:commands_to_add_users_and_groups [2021/12/06 06:28] (current) |
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| + | ====== Linux Users and Groups Commands ====== | ||
| + | ===== Simple Example ===== | ||
| + | <code> | ||
| + | useradd user007 -m -s /bin/bash | ||
| + | passwd user007 | ||
| + | adduser user007 www-data | ||
| + | </code> | ||
| + | |||
| + | ===== Adding Group ===== | ||
| + | Adding group someusername with a specific gid of 5001 | ||
| + | <code bash> | ||
| + | groupadd -g 5001 someusername | ||
| + | </code> | ||
| + | |||
| + | ===== Adding User ===== | ||
| + | Addding user someusername with a specific id, assign to gid 5001, etc | ||
| + | |||
| + | <code bash> | ||
| + | useradd -d /home/someusername -g 5001 -m -s /bin/bash -u 5001 -p somepassword someusername | ||
| + | </code> | ||
| + | |||
| + | ===== Appending a group to an existing user as secondary group ===== | ||
| + | Appending a group to an existing user as secondary group | ||
| + | |||
| + | <code> | ||
| + | usermod -a -G <group_name> <user_name> | ||
| + | </code> | ||
| + | |||
| + | Or | ||
| + | |||
| + | <code> | ||
| + | adduser <user_name> <group_name> | ||
| + | </code> | ||
| + | |||
| + | ===== View a user id ===== | ||
| + | <code> | ||
| + | id <user_name> | ||
| + | </code> | ||
| + | |||
| + | ===== Changing password ===== | ||
| + | This was done as root | ||
| + | <code> | ||
| + | echo "newpassword" | passwd --stdin <userid> | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ====== Sample ====== | ||
| + | * Create group and user vmail and add user to group | ||
| + | * Create /home/vmail directory and make that the default home directory for user | ||
| + | |||
| + | <code bash> | ||
| + | groupadd -g 5000 vmail | ||
| + | useradd -d /home/vmail -g 5000 -m -s /bin/bash -u 5000 -p somepassword vmail | ||
| + | usermod -a -G vmail vmail | ||
| + | id vmail | ||
| + | </code> | ||
| + | |||
| + | * Add user vmail to additional groups adm and sudo | ||
| + | |||
| + | <code> | ||
| + | adduser vmail adm | ||
| + | adduser vmail sudo | ||
| + | </code> | ||
| + | |||
| + | ===== Adding User - Alternative ===== | ||
| + | Adding group and user without specifying id. Also sets password. | ||
| + | <code bash> | ||
| + | UN=vipanicker | ||
| + | UN1="Vinod Panicker" | ||
| + | UN2="password" | ||
| + | groupadd $UN | ||
| + | useradd -d /home/$UN -g $UN -m -s /bin/bash -p somepassword $UN --comment "$UN1" | ||
| + | #useradd -d /home/$UN -g $UN -G wheel -m -s /bin/bash -p somepassword $UN --comment "$UN1" | ||
| + | echo "$UN2" | passwd --stdin $UN | ||
| + | </code> | ||
| + | |||
| + | ===== Adding User - Ubuntu ===== | ||
| + | Adding user johndoe - Run as root. This also gives johndoe sudo priviledges! | ||
| + | <code bash> | ||
| + | NEWUSER=vidman | ||
| + | groupadd ${NEWUSER} | ||
| + | useradd -d /home/${NEWUSER} -g ${NEWUSER} -G adm,cdrom,sudo,dip,plugdev,sambashare,lpadmin -m -s /bin/bash -p somepassword ${NEWUSER} | ||
| + | </code> | ||
| + | |||
| + | Setting password | ||
| + | <code bash> | ||
| + | passwd ${NEWUSER} | ||
| + | </code> | ||
| + | |||
| + | ===== Locking User - Ubuntu ===== | ||
| + | To disable or lock the password of an user account. This action prepends a ! to the password hash and the password will no longer match anymore. | ||
| + | |||
| + | <code> | ||
| + | # Disable user01's password | ||
| + | passwd -l user01 | ||
| + | </code> | ||
| + | To unlock user01 | ||
| + | <code> | ||
| + | # Enable password | ||
| + | passwd -u user01 | ||
| + | </code> | ||
| + | |||
| + | ===== Passwords ===== | ||
| + | Tested only on redhat | ||
| + | |||
| + | <code bash> | ||
| + | # List password policy | ||
| + | chage -l snathan | ||
| + | # Change to no expiry | ||
| + | chage -m 0 -M 99999 snathan | ||
| + | # Change password | ||
| + | passwd snathan | ||
| + | </code> | ||
