Linux new user

gistfile1.sh

# Create a new user.
adduser username


# Add a existing user to existing group.
# Add existing user tony to ftp supplementary/secondary group with usermod command using -a 
# option ~ i.e. add the user to the supplemental group(s). Use only with -G option :
usermod -a -G ftp tony

# Create a new group.
groupadd somegroup

# 创建一个只能用ssh key登录不能用密码登录的用户
sudo adduser --disabled-login deploy

# 设置目录创建文件时继承目录权限
chmod g+rs folder