Shulou(Shulou.com)06/02 Report--

How to restore mistakenly deleted tree commands

Examine the usage of rpm,yum

Delete the tree command. The 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...

Direct yum or rpm installation will prompt tree that it has been installed

[root@centos7 ~] # yum install tree

Loaded plugins: fastestmirror, langpacks

Loading mirror speeds from cached hostfile

Base: mirror.bit.edu.cnextras: mirrors.tuna.tsinghua.edu.cnupdates: 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

Solution: mandatory override installation

[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%]

4. Tree can be used at this time.

[root@centos7] # tree. -d

.

├── Desktop

├── Documents

├── Downloads

├── Music

├── Pictures

├── Public

├── scripts

├── Templates

└── Videos

9 directories

5. Yum can be reinstalled

[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

Of course, you can also find tree's rpm package, use rpm2cpio and cpio-id to extract the package, and move the tree command back to its original location

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