18.1 Introduction
A packaging and installation tool for Internet download packages, which is included with some Linux distributions. It generates files with .RPM extension. RPM is an acronym for RedHat Package Manager (RedHat Package Management Tool). Similar to the setup.exe of windows, although the name of this file format is marked with the RedHat logo, the concept is universal.
Linux distribution versions are used (suse, redhat, centos, etc.), which can be regarded as the industry standard.
18.2 Simple query command for rpm package:
Query installed rpm list rpm -qa | grep xx
Check if the current linux has firefox installed.
The basic format of rpm package name:
firefox-45.0.1-1.el6.centos.x86_64
Name: firefox
Version number: 45.0.1-1
Applicable operating system: el6.centos.x86_64 (indicates the 64-bit system of centos6.x, if it is i686, i386 means 32-bit system, noarch means general)
18.3 Other query commands for rpm packages
rpm -qa: Query all installed rpm packages
rpm -qa | more: paging display
rpm -qa | grep xxx
rpm -q xxx: Query whether the package is installed
rpm -qi xxx: Query package information
rpm -ql xxx: query files in packages
rpm -qf file full path name: query the package to which the file belongs
18.4 Uninstall rpm package
rpm -e the name of the package
Details:
(1) If other packages depend on the package you want to uninstall, an error message will be generated when uninstalling.
(2) If we just want to delete this package, we can add the parameter --nodeps to force deletion, but this is generally not recommended, because programs that depend on this package may not run.
18.5 Install rpm package
rpm -ivh package full pathname
i=install install
v=verbose hint
h=hash progress bar
Note: First mount the iso file where we installed centos, and then go to /media/ to find the rpm package. It will be installed by default.
install firefox
(1) First enter the Packages directory to find out whether there is a firefox installation package
(2) Generally, it is not installed in this file directory, copy it to /opt
(3) Installation
