tree命令的安装和使用

安装

需求：

打印出当前目录的文件结构

命令：

tree -Cd -L 5

tree命令的中文意思为“树”，功能是以树形结构列出指定目录下的所有内容，包括所有文件、子目录及子目录里的目录和文件。

报错

01

root@iZ8vbfxqax8z5y6femcwxaZ:~/baidu# 
Command 'tree' not found, but can be installed with:
apt install tree

原因： 看来系统是ubuntu，系统默认没有安装tree命令

apt install tree

02

Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 google-chrome-stable : Depends: fonts-liberation but it is not going to be installed
                        Depends: libappindicator3-1 but it is not going to be installed
                        Depends: libasound2 (>= 1.0.16)
                        Depends: libatk-bridge2.0-0 (>= 2.5.3) but it is not going to be installed
                        Depends: libatspi2.0-0 (>= 2.9.90) but it is not going to be installed
                        Depends: libgtk-3-0 (>= 3.9.10) but it is not going to be installed
                        Depends: libx11-xcb1 but it is not going to be installed
                        Depends: libxtst6 but it is not going to be installed
                        Depends: xdg-utils (>= 1.0.2) but it is not going to be installed
                        Recommends: libu2f-udev but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

原因： 系统包有损坏，来修复这些安装包就行了

apt --fix-broken install

03

......

E: Failed to fetch http://mirrors.cloud.aliyuncs.com/ubuntu/pool/main/m/mesa/libgl1-mesa-glx_19.0.8-0ubuntu0~18.04.3_amd64.deb  404  Not Found [IP: 100.100.2.148 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

原因：包向source里的资源下载失败了，但是原因是多种多样的，首先根据提示操作

apt-get update 

问题解决

root@iZ8vbfxqax8z5y6femcwxaZ:~/baidu# apt-get update 
Hit:1 http://mirrors.cloud.aliyuncs.com/ubuntu bionic InRelease

......

Get:23 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6/multiverse amd64 Packages [13.0 kB]
Fetched 8,552 kB in 3s (2,952 kB/s)   
Reading package lists... Done

tree的常规使用

1. 查看帮助：

tree --help

2. 常用参数

其中常用参数：

• -a：打印全部文件。
• -A：使用ASNI绘图字符显示树状图而非以ASCII字符组合（显示的树状图为实线不是虚线）。
• -C：在文件和目录清单加上色彩，便于区分各种类型。
• -d：只打印目录。
• -L level：指定打印目录的深度（层级）。
• -f：打印出每个文件、目录的绝对路径。

还可以在树状目录结构中打印出文件的所属用户和uid、所属组和gid、文件大小、文件修改时间等