在Ubuntu中打开MySQL，进入相应目录，执行命令sudo ./mysqld_safe -user=mysql &
因为shell刚打开需输入密码，结果如下，此时输入密码也会报错，要先执行另一个sudo命令才行
zhang@zhang-laptop:~$ cd /usr/local/mysql/bin
zhang@zhang-laptop:/usr/local/mysql/bin$ sudo ./mysqld_safe -user=mysql &
[1] 6197
zhang@zhang-laptop:/usr/local/mysql/bin$ Password:
[1]+ Stopped sudo ./mysqld_safe -user=mysql
zhang@zhang-laptop:/usr/local/mysql/bin$ sudo ls
Password:
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zhang@zhang-laptop:/usr/local/mysql/bin$ sudo ./mysqld_safe -user=mysql &
[2] 6211
zhang@zhang-laptop:/usr/local/mysql/bin$ Starting mysqld daemon with databases from /usr/local/mysql/var
zhang@zhang-laptop:/usr/local/mysql/bin$