How to recover accidentally deleted tree command

How to recover accidentally deleted tree command

Study rpm, yum usage

First, delete the command tree, tree command is not available

[root@centos7 ~]# which tree
/usr/bin/tree
[root@centos7 ~]# rm -f /usr/bin/tree 
[root@centos7 ~]# tree .
bash: tree: command not found...

Second, direct yum or rpm will be prompted to install tree has been installed

[root@centos7 ~]# yum install tree
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirror.bit.edu.cn
 * extras: mirrors.tuna.tsinghua.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
base                                                                         | 3.6 kB  00:00:00     
extras                                                                       | 3.4 kB  00:00:00     
nginx                                                                        | 2.9 kB  00:00:00     
updates                                                                      | 3.4 kB  00:00:00     
Package tree-1.6.0-10.el7.x86_64 already installed and latest version
Nothing to do
[root@centos7 ~]# rpm -ivh /misc/cd/Packages/tree-1.6.0-10.el7.x86_64.rpm 
Preparing...                          ################################# [100%]
    package tree-1.6.0-10.el7.x86_64 is already installed

Third, the solution: install mandatory coverage

[root@centos7 ~]# rpm --help
--replacepkgs                    reinstall if the package is already present
[root@centos7 ~]# rpm -ivh /misc/cd/Packages/tree-1.6.0-10.el7.x86_64.rpm --replacepkgs
Preparing...                          ################################# [100%]
Updating / installing...
   1:tree-1.6.0-10.el7                ################################# [100%]

Fourth, this time the tree is ready to use

[root@centos7 ~]# tree . -d
.
├── Desktop
├── Documents
├── Downloads
├── Music
├── Pictures
├── Public
├── scripts
├── Templates
└── Videos

9 directories

Five, yum, then you can re-install

[root@centos7 ~]# yum --help
reinstall      reinstall a package
[root@centos7 ~]# rm -f /usr/bin/tree 
[root@centos7 ~]# tree -d .
-bash: /usr/bin/tree: No such file or directory
[root@centos7 ~]# yum reinstall tree -y
[root@centos7 ~]# tree -d .
.
├── Desktop
├── Documents
├── Downloads
├── Music
├── Pictures
├── Public
├── scripts
├── Templates
└── Videos

9 directories