如题，如何解决，
命令行如下
wind@wind-desktop:~$ sudo vi/etc/apt/sources.list
sudo: vi/etc/apt/sources.list: command not found
wind@wind-desktop:~$ vi/etc/apt/sources.list
bash: vi/etc/apt/sources.list: No such file or directory
wind@wind-desktop:~$ sudo su
root@wind-desktop:/home/wind# vi/etc/apt/sources.list
bash: vi/etc/apt/sources.list: No such file or directory
root@wind-desktop:/home/wind#

vi后面加空格

新手新手，谢谢了