判断输入用户名是否存在---练习记录

 

 

判断输入用户名是否存在

 

#!/bin/bash
echo "Please input username:"
read username
grep "$username" /etc/passwd > /dev/null
if [ $? -eq 0 ]
  then
      echo "The user is exist."
  else
      echo "The user is no exist."
fi