首先查看安装的软件包，或者时候安装有某某软件包的命令
rpm （-qa）| grep 软件名
root@mode oldboy]# rpm -qa| grep openssl
openssl-devel-0.9.8e-22.el5
openssl-0.9.8e-22.el5
openssl-0.9.8e-22.el5
openssl-devel-0.9.8e-22.el5
[root@mode oldboy]# yum search openssl
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
file:///mnt/cdrom/repodata/repomd.xml: [Errno 5] OSError: [Errno 2] No such file or directory: '/mnt/cdrom/repodata/repomd.xml'
Trying other mirror.
=============================== Matched: openssl ===============================
m2crypto.x86_64 : Support for using OpenSSL in python scripts
openssl.i686 : The OpenSSL toolkit
openssl.x86_64 : The OpenSSL toolkit
openssl-devel.i386 : Files for development of applications which will use
: OpenSSL
openssl-devel.x86_64 : Files for development of applications which will use
: OpenSSL
openssl-perl.x86_64 : Perl scripts provided with OpenSSL
openssl097a.i386 : The OpenSSL toolkit
openssl097a.x86_64 : The OpenSSL toolkit
perl-Crypt-SSLeay.x86_64 : Crypt::SSLeay - OpenSSL glue that provides LWP https
: support
perl-Net-SSLeay.x86_64 : Perl extension for using OpenSSL
pyOpenSSL.x86_64 : Python wrapper module around the OpenSSL library
xmlsec1.i386 : Library providing support for "XML Signature" and "XML
: Encryption" standards
xmlsec1.x86_64 : Library providing support for "XML Signature" and "XML
: Encryption" standards
xmlsec1-openssl.i386 : OpenSSL crypto plugin for XML Security Library
xmlsec1-openssl.x86_64 : OpenSSL crypto plugin for XML Security Library
xmlsec1-openssl-devel.i386 : OpenSSL crypto plugin for XML Security Library
xmlsec1-openssl-devel.x86_64 : OpenSSL crypto plugin for XML Security Librar假设在生产环境中，系统的关键文件/etc/inittab被删除了（系统还没重新启动。崩溃前），不要急。以下告诉你该怎样处理。 1、模拟误删除文件 [root@localhost ~]# rm -rf /etc/inittab [root@localhost ~]# cat /etc/inittab cat: /etc/inittab: No such file or directory 2、新建该文件，并查看相应包的相关信息 [root@localhost ~]# touch /etc/inittab [root@localhost ~]# rpm -qf /etc/inittab initscripts-8.45.19.EL-1 3、确定了包的相关信息，挂载安装光盘，进行查找 [root@localhost ~]# cd /mnt/yum/ [root@localhost yum]# ll total 0 [root@localhost yum]# cd ~ [root@localhost ~]# mount /dev/cdrom /mnt/yum mount: block device /dev/cdrom is write-protected, mounting read-only [root@localhost ~]# cd /mnt/yum/Server/ [root@localhost Server]# cp initscripts-8.45.30-2.el5.i386.rpm /tmp cp: overwrite `/tmp/initscripts-8.45.30-2.el5.i386.rpm'? y [root@localhost Server]# cd /tmp [root@localhost tmp]# ll total 1680 drwx------ 2 root root 4096 Feb 17 13:45 bin drwx------ 9 root root 4096 Feb 17 13:45 etc drwx------ 3 root root 4096 Feb 17 13:53 gconfd-root -r--r--r-- 1 root root 1651907 Feb 17 15:41 initscripts-8.45.30-2.el5.i386.rpm drwx------ 2 root root 4096 Feb 17 13:53 keyring-06YG9F drwx------ 2 root root 4096 Sep 26 08:44 keyring-elqVM1 drwx------ 2 root root 4096 Sep 26 08:08 keyring-jTNbTb drwx------ 3 root root 4096 Feb 17 13:45 lib srwxr-xr-x 1 root root 0 Feb 17 13:54 mapping-root drwx------ 2 root root 4096 Feb 17 15:38 orbit-root drwx------ 2 root root 4096 Feb 17 13:45 sbin drwx------ 2 root root 4096 Feb 17 13:53 ssh-ROxTuK6949 drwx------ 4 root root 4096 Feb 17 13:45 usr drwx------ 4 root root 4096 Feb 17 13:45 var drwx------ 2 root root 4096 Feb 17 13:54 virtual-root.2eelUV drwxrwxrwt 2 root root 4096 Feb 5 12:19 VMwareDnD drwx------ 2 root root 4096 Feb 17 13:53 vmware-root 4、解压包的信息 [root@localhost tmp]# rpm2cpio initscripts-8.45.30-2.el5.i386.rpm |cpio -imd 10748 blocks [root@localhost tmp]# ll total 1680 drwx------ 2 root root 4096 Feb 17 13:45 bin drwx------ 9 root root 4096 Feb 17 13:45 etc drwx------ 3 root root 4096 Feb 17 13:53 gconfd-root -r--r--r-- 1 root root 1651907 Feb 17 15:41 initscripts-8.45.30-2.el5.i386.rpm drwx------ 2 root root 4096 Feb 17 13:53 keyring-06YG9F drwx------ 2 root root 4096 Sep 26 08:44 keyring-elqVM1 drwx------ 2 root root 4096 Sep 26 08:08 keyring-jTNbTb drwx------ 3 root root 4096 Feb 17 13:45 lib srwxr-xr-x 1 root root 0 Feb 17 13:54 mapping-root drwx------ 2 root root 4096 Feb 17 15:38 orbit-root drwx------ 2 root root 4096 Feb 17 13:45 sbin drwx------ 2 root root 4096 Feb 17 13:53 ssh-ROxTuK6949 drwx------ 4 root root 4096 Feb 17 13:45 usr drwx------ 4 root root 4096 Feb 17 13:45 var drwx------ 2 root root 4096 Feb 17 13:54 virtual-root.2eelUV drwxrwxrwt 2 root root 4096 Feb 5 12:19 VMwareDnD drwx------ 2 root root 4096 Feb 17 13:53 vmware-root 5、进行文件替换与简单改动 [root@localhost tmp]# cp ./etc/inittab /etc/ cp: overwrite `/etc/inittab'? y [root@localhost tmp]# cat /etc/inittab 收工！！！！！
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rpm -qf 软件名