Linux Package Management related commands

Following command lists all the currently installed packages and captures only those lines which have the word sendmail in them
[root@badar /]# rpm -qa | grep apache
or
[root@badar /]# rpm -qa apache*


To check presence of the package 'telnet' in the system, use the following command:
[root@badar /]# rpm -q telnet


Following command lists all the information about the specific installed  package.
[root@badar /]# rpm -qi nfs


Following command lists all the documentation files and their location of a particular installed package.
[root@badar /]# rpm -qd sendmail


Following command lists file locations of all of the files of a particular installed package.
[root@badar /]# rpm -ql sendmail


Following command lists all information of the un-installed package:
[root@badar /]# rpm -qpi telnet-1.1-39.2.i586.rpm


Similarly,you can check the list of files a package contains, before actually installing it:
[root@badar /]# rpm -qpl telnet-1.1-39.2.i586.rpm


Install rpm from (mounted) SLES DVD by using the following command:
[root@badar /]# rpm -ivh /mnt/cdrom/SLES/RPMS/ssh*.rpm


If an older version of the package is installed and you want to upgrade it to a new version, then use (U):
[root@badar /]# rpm -Uvh /mnt/cdrom/SLES/RPMS/ssh*.rpm


If some version of a package is installed but some files got corrupted, and you want to re-install it then use –force with it while installing.
[root@badar /]# rpm -ivh –-force /mnt/cdrom/SLES/RPMS/ssh*.rpm


Following command erases (removes / un-installs ) a specific package.
[root@badar /]# rpm -e sendmail

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