Linux user configuration

新建用户配置：/etc/default/useradd

新建用户的隐藏文件在：/etc/skel

migration user:

1. migrate files: /etc/passwd, /etc/shadow, /etc/group, /etc/gshadow;

2. migrate folder: /home

3. migrate mail: /var/mail

normal user account get root privilege

1. root grant privilege

root account: use command "visudo" to modify /etc.sudoers file

normal account: sudo <command>

2. change to root account to execute command

3. change the privilege of command such as ifconfig

chmod u+s <command>

After this, user can execute the command

umask

config file /etc/bashrc

Default

root umask 022--> file 666 - 022 = 644; folder 777-022 = 755

other user umask 002 --> file 666 - 002 = 664; folder 777 - 002 = 775

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