站群系统
相信ls命令每个人都用过，可是如果不小心在linux的命令行中输入sl会有什么效果呢 ？
当然可能是这个效果，那我们安装一下试试吧。
mgm@ubuntu:~$ sl
The program 'sl' is currently not installed. You can install it by typing:
sudo apt install sl
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嗯？ 提示错误
mgm@ubuntu:~$ sudo apt-get install sl
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
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这种情况是因为apt在运行，查看一下情况吧
mgm@ubuntu:~$ ps afx|grep apt
677 ? Ss 0:00 /bin/sh /usr/lib/apt/apt.systemd.daily
2362 pts/0 S+ 0:00 \_ grep --color=auto apt
2118 ? SNl 0:00 /usr/bin/python3 /usr/sbin/aptd
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kill them