误删tree命令如何恢复

考察rpm,yum的用法

一、删除tree命令，tree命令不可用

[[email?protected] ~]# which tree
/usr/bin/tree
[[email?protected] ~]# rm -f /usr/bin/tree 
[[email?protected] ~]# tree .
bash: tree: command not found...

二、直接yum或rpm安装将提示tree已经安装

[[email?protected] ~]# 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
[[email?protected] ~]# 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

三、解决办法：强制覆盖安装

[[email?protected] ~]# rpm --help
--replacepkgs                    reinstall if the package is already present
[[email?protected] ~]# 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%]

四、此时的tree已经可以使用

[[email?protected] ~]# tree . -d
.
├── Desktop
├── Documents
├── Downloads
├── Music
├── Pictures
├── Public
├── scripts
├── Templates
└── Videos

9 directories

五、yum的话可以重新安装

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

9 directories