linux如何删除tree命令,误删tree命令如何恢复

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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

[root@centos7 ~]# which tree

/usr/bin/tree

[root@centos7 ~]# rm -f /usr/bin/tree

[root@centos7 ~]# tree .

bash: tree: command not found…

二、直接yum或rpm安装将提示tree已经安装

[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

三、解决办法：强制覆盖安装

[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%]

四、此时的tree已经可以使用

[root@centos7 ~]# tree . -d

.

├── Desktop

├── Documents

├── Downloads

├── Music

├── Pictures

├── Public

├── scripts

├── Templates

└── Videos

9 directories

五、yum的话可以重新安装

[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

六、当然还可以找到tree的rpm包，使用rpm2cpio和cpio -id解压包，并将tree命令移回到原来的位置

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