➜ workspace git:(master) ✗ sudo apt install tree # 安装tree这个小工具,其作用:list contents of directories in a tree-like format Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required: openssh-sftp-server Use 'sudo apt autoremove' to remove it. The following NEW packages will be installed: tree 0 upgraded, 1 newly installed, 0 to remove and 48 not upgraded. Need to get 40.6 kB of archives. After this operation, 138 kB of additional disk space will be used. Get:1 http://mirrors.163.com/ubuntu xenial/universe amd64 tree amd64 1.7.0-3 [40.6 kB] Fetched 40.6 kB in 7s (5,764 B/s) debconf: delaying package configuration, since apt-utils is not installed Selecting previously unselected package tree. (Reading database ... 32133 files and directories currently installed.) Preparing to unpack .../tree_1.7.0-3_amd64.deb ... Unpacking tree (1.7.0-3) ... Setting up tree (1.7.0-3) ...