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Check the installed RPM packages.

Check the installed RPM packages.

Red Hat Enterprise Linux and CentOS, which was developed based on Red Hat Enterprise Linux, use a package management tool called RPM (Redhat Package Manager).。
RPM is a handy management tool that allows you to easily install and uninstall software and manage RPM packages with dependencies in mind, preventing you from accidentally removing RPM packages that you need.
If you want to use this RPM, use the “rpm” command.
Use the “-q” option to examine the RPM packages already installed, and the “-a” option to list the installed packages.
rpm -qa” alone will show you all the packages installed on your Linux system, and is not suitable for checking specific packages.
It is not suitable for checking a specific package.
To check if a specific package is installed, specify the PRM package you want to check in “rpm -qa”.

●Check the installed RPM packages one screen at a time.

[root@Lion ~]# rpm -qa | more
swig-2.0.10-5.el7.x86_64
perl-Archive-Tar-1.92-2.el7.noarch
libstoragemgmt-python-1.6.2-4.el7.noarch
strace-4.12-9.el7.x86_64
perl-Sys-Syslog-0.33-3.el7.x86_64
elfutils-0.172-2.el7.x86_64
kbd-legacy-1.15.5-15.el7.noarch
ctags-5.8-13.el7.x86_64
perl-Text-Diff-1.41-5.el7.noarch
grub2-tools-extra-2.02-0.76.el7.centos.x86_64
bash-4.2.46-31.el7.x86_64
iwl105-firmware-18.168.6.1-69.el7.noarch

<abbreviation>
<
bind-libs-9.9.4-72.el7.x86_64
abrt-tui-2.1.11-52.el7.centos.x86_64
e
lfutils-libelf-0.172-2.el7.x86_64
–continue–

●Check for specific installation RPM packages (http-related packages will be displayed).

[root@Lion ~]# rpm -qa | grep http
perl-LWP-Protocol-https-6.04-4.el7.noarch
httpd-tools-2.4.6-88.el7.centos.x86_64
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