Add a user and add a group in Linux

Add a user and add a group in Linux

1. Create a user whose username and password are hadoop:

Useradd hadoop

Passwd hadoop

1. We have a group named hadoops.

Groupadd hadoops

2. Add hadoop users to the hadoops group.

Gpasswd-a hadoop hadoops

Adding user hadoop to group hadoops -- if this line appears, it indicates that the addition is successful.

Returns the hadoop user to the hadoops group.

Gpasswd-d hadoop hadoops

Removing user hadoop from group hadoops -- if this line is displayed, the operation is successfully removed.

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