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linux~添加组_添加用户_为用户加密码
source link: https://www.cnblogs.com/lori/p/15881789.html
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echo传递命令参数
总结一个linux小技巧，主要是设置用户密码，通过echo输出密码到命令passwd，并使用输入参数--stdin将用户名传入，命令如下：
# 添加mysql组
groupadd mysql
# 添加用户test到mysql组
useradd test -g mysql
# 为test用户设置密码123456
echo "123456" | passwd --stdin test
cat命令追加文件内容(cat >>)
$ cat >> /etc/hosts << EOF
192.168.1.156 node1
192.168.1.167 node2
192.168.1.168 node3
EOF
cat命令覆盖文件内容(catr >)
$ cat > /etc/hosts << EOF
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.156 node1
192.168.1.167 node2
192.168.1.168 node3
EOF
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