The useradd command is used to create a new user or update default new user information from the command line. However, sometimes you need to create a large number of users or import usernames from a text file. You can use newusers command, which update and create new users in batch.
This is useful at universities or large corporate Linux networks. Adding users in batch saves the time.
Task: Set Password
Type the following command to change or set user password:
echo "username:password" | newusers
For example, change user password for vivek user:
echo "vivek:myUltraSecretPassword" | newusers
Task: Update and create new users in batch
newusers command reads a file of user name and clear-text password pairs and uses this information to update a group of existing users or to create new users. Each line is in the same format as the standard password file.
This command is intended to be used in a large system environment where many accounts are updated at a single time (batch mode). Since username and passwords are stored in clear text format make sure only root can read/write the file. Use chmod command:
# touch /root/batch-user-add.txt
# chmod 0600 /root/batch-user-add.txt
Create a user list as follows. Open file:
# vi /root/batch-user-add.txt
Append username and password:
- man page of the newusers command for more information.