Centos manually create a new user

When we want to create a user, we usually use the Useradd command to automatically create a user, in fact, under Linux, everything is file, set several files, but also can create a user:

The file is as follows:

/ETC/PASSWD: User

/etc/shadow: Password

/home/username: User Home Directory

/etc/group: User groups

/etc/skel/*: The file in this directory is actually the skeleton of the file under the user's home directory. Under the Useradd command, it is automatically copied to the/home/username

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Create a user User01 based on the above file:

1. Use Nano to edit/etc/passwd, add it on the last line:

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Format description

User name: Password placeholder: uid:gid: Home directory path: Default shell

2. Use Nano to edit/etc/passwd, add it on the last line :

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Format description

Group name: Password placeholder: GID: comma-delimited list of users belonging to this group (as an additional group)

3, Cp-r/etc/skel/home/user01, and view copy of the past files

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Recursively modifies the owner and genus of the directory:

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4, then modify the permissions of the file, only belong to the main group to have permission

Use SU-switch user, find user can log in

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5, however, through the pseudo-terminal, you need to enter a password, so you need to add a new user in the last line of/etc/shadow, and to configure the password for the new user.

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Format description

User name: encrypted password: Last time password change: password minimum Age: Password maximum age (excluding the start date): password Expiration warning interval : password inactivity period (change password, others can not change): Account Expiration period: Reserved area

Therefore, you need to generate a password:

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Put it in the/etc/shadow "!!" Position:

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Above, the user adds it to the end.

Centos manually create a new user