完成此操作后，yum remove crontabs运行后出现yum：-bash: /usr/bin/yum: No such file or directory
这是输出yum remove crontabs：
[root@vs270 opt]# yum remove crontabs
Loaded plugins: fastestmirror
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package crontabs.noarch 0:1.10-8 set to be erased
--> Processing Dependency: crontabs for package: rpm
--> Running transaction check
---> Package rpm.x86_64 0:4.4.2.3-20.el5_5.1 set to be erased
--> Processing Dependency: rpm = 4.4.2.3-20.el5_5.1 for package: rpm-python
--> Processing Dependency: rpm = 4.4.2.3-20.el5_5.1 for package: rpm-libs
--> Processing Dependency: rpm >= 3.0.5 for package: apt
--> Processing Dependency: rpm >= 4.4.2 for package: yum
--> Running transaction check
---> Package apt.x86_64 0:0.5.15lorg3.94a-5.el5.rf set to be erased
---> Package rpm-libs.x86_64 0:4.4.2.3-20.el5_5.1 set to be erased
---> Package rpm-python.x86_64 0:4.4.2.3-20.el5_5.1 set to be erased
---> Package yum.noarch 0:3.2.22-26.el5.centos set to be erased
--> Processing Dependency: yum >= 3.0 for package: yum-fastestmirror
--> Running transaction check
---> Package yum-fastestmirror.noarch 0:1.1.16-14.el5.centos.1 set to be erased
--> Processing Dependency: /bin/rpm for package: policycoreutils
--> Restarting Dependency Resolution with new changes.
--> Running transaction check
---> Package policycoreutils.x86_64 0:1.33.12-14.8.el5 set to be erased
--> Processing Dependency: policycoreutils >= 1.33.12-14.5 for package: selinux-policy
--> Processing Dependency: policycoreutils for package: setools
--> Running transaction check
---> Package selinux-policy.noarch 0:2.4.6-279.el5_5.2 set to be erased
---> Package setools.x86_64 0:3.0-3.el5 set to be erased
--> Finished Dependency Resolution
Dependencies Resolved
====================================================================================================================================================================================================
Package Arch Version Repository Size
====================================================================================================================================================================================================
Removing:
crontabs noarch 1.10-8 installed 1.0 k
Removing for dependencies:
apt x86_64 0.5.15lorg3.94a-5.el5.rf installed 8.5 M
policycoreutils x86_64 1.33.12-14.8.el5 installed 2.1 M
rpm x86_64 4.4.2.3-20.el5_5.1 installed 3.6 M
rpm-libs x86_64 4.4.2.3-20.el5_5.1 installed 2.0 M
rpm-python x86_64 4.4.2.3-20.el5_5.1 installed 131 k
selinux-policy noarch 2.4.6-279.el5_5.2 installed 7.5 M
setools x86_64 3.0-3.el5 installed 3.3 M
yum noarch 3.2.22-26.el5.centos installed 3.2 M
yum-fastestmirror noarch 1.1.16-14.el5.centos.1 installed 47 k
Transaction Summary
====================================================================================================================================================================================================
Remove 10 Package(s)
Reinstall 0 Package(s)
Downgrade 0 Package(s)
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Erasing : crontabs 1/10
Erasing : rpm-python 2/10
Erasing : yum 3/10
warning: /etc/yum.conf saved as /etc/yum.conf.rpmsave
Erasing : apt 4/10
warning: /etc/apt/sources.list.d/os.list saved as /etc/apt/sources.list.d/os.list.rpmsave
Erasing : rpm 5/10
Erasing : selinux-policy 6/10
Erasing : policycoreutils 7/10
Erasing : rpm-libs 8/10
Erasing : yum-fastestmirror 9/10
Erasing : setools 10/10
Removed:
crontabs.noarch 0:1.10-8
Dependency Removed:
apt.x86_64 0:0.5.15lorg3.94a-5.el5.rf policycoreutils.x86_64 0:1.33.12-14.8.el5 rpm.x86_64 0:4.4.2.3-20.el5_5.1 rpm-libs.x86_64 0:4.4.2.3-20.el5_5.1
rpm-python.x86_64 0:4.4.2.3-20.el5_5.1 selinux-policy.noarch 0:2.4.6-279.el5_5.2 setools.x86_64 0:3.0-3.el5 yum.noarch 0:3.2.22-26.el5.centos
yum-fastestmirror.noarch 0:1.1.16-14.el5.centos.1
Complete!
有没有关于如何在没有 YUM 的情况下重新安装 YUM 的想法？谢谢 :D
答案1
可以通过解压 RPM-rpm（啊哈）包中的文件来安装 RPM。这将使您再次开始，并且您还可以安装 yum。首先创建您将用于解压 RPM 存档中的文件的目录并下载 RPM 包。
mkdir /tmp/becarefulnexttime
cd /tmp/becarefulnexttime
wget http://ftp.tudelft.nl/centos.org/5/os/x86_64/CentOS/rpm-4.4.2.3-22.el5.x86_64.rpm
确保您下载了与您的 CentOS 版本/架构相对应的 RPM 版本，但查看您的 yum 输出我认为是这样。
现在，从 RPM 存档中提取文件并将重要文件复制到 CentOS 安装根目录。
rpm2cpio rpm-4.4.2.3-22.el5.x86_64.rpm | cpio -dim
find . -type d -exec chmod 755 {} \;
tar cf - ./usr ./etc | (cd /; tar xvf -)
您现在应该有一个可以工作的 rpm 命令，重建 RPM 数据库并正确安装 RPM：
rpm --rebuilddb
rpm -i rpm-4.4.2.3-22.el5.x86_64.rpm
您可能需要先前删除一些额外的依赖项，但现在应该可以再次安装 yum
rpm -i http://ftp.tudelft.nl/centos.org/5/os/x86_64/CentOS/yum-3.2.22-33.el5.centos.noarch.rpm
答案2
您可能需要手动重新编译 rpm 包，安装它，然后安装 yum，但除非这是一个关键任务箱，否则备份您的配置并重新安装可能会更快。
答案3
尝试从源安装焦油球。