输入一个用户名，判断该用户是admin用户或者普通用户
由于管理员用户id是1-500，而普通用户是501以上
[root@localhost ~]# vim /tmp/uidex.sh #!/bin/bash username=$1 if [ "$username" = "" ];then echo "Please input a username" exit 1 fi if id $username &> /dev/null;then userid=$(id -u $username) if [ $userid -lt 500 ]; then echo "$username is a admin user" else echo "$username is a normal user" fi else echo "$username is not exit" useradd $username if [ $? -eq 0 ]; then #判断用户是否添加成功 echo "Add user $username." else echo "Can not add $username." fi fi
id $username &> /dev/null 这重定向把无用的输出消除