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 opensslopenssl-devel-0.9.8e-22.el5openssl-0.9.8e-22.el5openssl-0.9.8e-22.el5openssl-devel-0.9.8e-22.el5[root@mode oldboy]# yum search opensslLoaded plugins: fastestmirror, securityLoading mirror speeds from cached hostfilefile:///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 scriptsopenssl.i686 : The OpenSSL toolkitopenssl.x86_64 : The OpenSSL toolkitopenssl-devel.i386 : Files for development of applications which will use: OpenSSLopenssl-devel.x86_64 : Files for development of applications which will use: OpenSSLopenssl-perl.x86_64 : Perl scripts provided with OpenSSLopenssl097a.i386 : The OpenSSL toolkitopenssl097a.x86_64 : The OpenSSL toolkitperl-Crypt-SSLeay.x86_64 : Crypt::SSLeay – OpenSSL glue that provides LWP https: supportperl-Net-SSLeay.x86_64 : Perl extension for using OpenSSLpyOpenSSL.x86_64 : Python wrapper module around the OpenSSL libraryxmlsec1.i386 : Library providing support for "XML Signature" and "XML: Encryption" standardsxmlsec1.x86_64 : Library providing support for "XML Signature" and "XML: Encryption" standardsxmlsec1-openssl.i386 : OpenSSL crypto plugin for XML Security Libraryxmlsec1-openssl.x86_64 : OpenSSL crypto plugin for XML Security Libraryxmlsec1-openssl-devel.i386 : OpenSSL crypto plugin for XML Security Libraryxmlsec1-openssl-devel.x86_64 : OpenSSL crypto plugin for XML Security Librar
如果在生产环境中，系统的重要文件/etc/inittab被删除了（系统还没重启，，崩溃前），不要急，下面告诉你该如何处理。1、模拟误删除文件[root@localhost ~]# rm -rf /etc/inittab[root@localhost ~]# cat /etc/inittabcat: /etc/inittab: No such file or directory2、新建该文件，并查看对应包的相关信息[root@localhost ~]# touch /etc/inittab[root@localhost ~]# rpm -qf /etc/inittabinitscripts-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]# lltotal 0[root@localhost yum]# cd ~[root@localhost ~]# mount /dev/cdrom /mnt/yummount: 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 /tmpcp: overwrite `/tmp/initscripts-8.45.30-2.el5.i386.rpm'? y[root@localhost Server]# cd /tmp[root@localhost tmp]# lltotal 1680drwx—— 2 root root 4096 Feb 17 13:45 bindrwx—— 9 root root 4096 Feb 17 13:45 etcdrwx—— 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.rpmdrwx—— 2 root root 4096 Feb 17 13:53 keyring-06YG9Fdrwx—— 2 root root 4096 Sep 26 08:44 keyring-elqVM1drwx—— 2 root root 4096 Sep 26 08:08 keyring-jTNbTbdrwx—— 3 root root 4096 Feb 17 13:45 libsrwxr-xr-x 1 root root0 Feb 17 13:54 mapping-rootdrwx—— 2 root root 4096 Feb 17 15:38 orbit-rootdrwx—— 2 root root 4096 Feb 17 13:45 sbindrwx—— 2 root root 4096 Feb 17 13:53 ssh-ROxTuK6949drwx—— 4 root root 4096 Feb 17 13:45 usrdrwx—— 4 root root 4096 Feb 17 13:45 vardrwx—— 2 root root 4096 Feb 17 13:54 virtual-root.2eelUVdrwxrwxrwt 2 root root 4096 Feb 5 12:19 VMwareDnDdrwx—— 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 -imd10748 blocks[root@localhost tmp]# lltotal 1680drwx—— 2 root root 4096 Feb 17 13:45 bindrwx—— 9 root root 4096 Feb 17 13:45 etcdrwx—— 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.rpmdrwx—— 2 root root 4096 Feb 17 13:53 keyring-06YG9Fdrwx—— 2 root root 4096 Sep 26 08:44 keyring-elqVM1drwx—— 2 root root 4096 Sep 26 08:08 keyring-jTNbTbdrwx—— 3 root root 4096 Feb 17 13:45 libsrwxr-xr-x 1 root root0 Feb 17 13:54 mapping-rootdrwx—— 2 root root 4096 Feb 17 15:38 orbit-rootdrwx—— 2 root root 4096 Feb 17 13:45 sbindrwx—— 2 root root 4096 Feb 17 13:53 ssh-ROxTuK6949drwx—— 4 root root 4096 Feb 17 13:45 usrdrwx—— 4 root root 4096 Feb 17 13:45 vardrwx—— 2 root root 4096 Feb 17 13:54 virtual-root.2eelUVdrwxrwxrwt 2 root root 4096 Feb 5 12:19 VMwareDnDdrwx—— 2 root root 4096 Feb 17 13:53 vmware-root5、进行文件替换与简单修改[root@localhost tmp]# cp ./etc/inittab /etc/cp: overwrite `/etc/inittab'? y[root@localhost tmp]# cat /etc/inittab收工！！！！！！！
yum search 软件名
rpm -qf 软件名
有一种旅行，叫单车旅行。它没有奢侈准备，
