需要注意的是:
修改密码的命令必须这样写:
步骤一:登录PostgreSQL

sudo -u postgres psql
步骤二:修改登录PostgreSQL密码

ALTER USER postgres WITH PASSWORD ‘postgres’;
注:

密码postgres要用引号引起来
命令最后有分号
3如果重启服务出现错误:
sudo service postgres restart
Failed to restart postgres.service: Unit postgres.service not found.
则运行sudo systemctl restart postgresql
4如果重启服务出现错误:
sudo service postgres restart
Failed to restart postgresql.service: Unit postgresql.service is masked…
则运行 systemctl unmask postgresql
sudo systemctl restart postgresql

https://blog.csdn.net/zpf336/article/details/50843674

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