How to check which software is installed on centos

Use rpm to query all packages that centos has installed:

rpm -qa
rpm -qa|less//List installation package information in pages

[root@localhost /]# rpm -qa|less
linux-firmware-20180911-69.git85c5d90.el7.noarch
kbd-legacy-1.15.5-15.el7.noarch
kbd-1.15.5-15.el7.x86_64
bash-4.2.46-31.el7.x86_64
NetworkManager-tui-1.12.0-6.el7.x86_64
nss-softokn-freebl-3.36.0-5.el7_5.x86_64
grub2-2.02-0.76.el7.centos.x86_64
glibc-2.17-260.el7.x86_64
authconfig-6.2.8-30.el7.x86_64
libstdc++-4.8.5-36.el7.x86_64
irqbalance-1.0.7-11.el7.x86_64
popt-1.13-16.el7.x86_64
biosdevname-0.7.3-1.el7.x86_64
libattr-2.4.46-13.el7.x86_64
iprutils-2.4.16.1-1.el7.x86_64
libselinux-2.5-14.1.el7.x86_64
sudo-1.8.23-3.el7.x86_64
keyutils-libs-1.5.8-3.el7.x86_64
libsysfs-2.1.0-16.el7.x86_64

RPM is the abbreviation of Red-Hat Package Manager (RPM package manager). Although this file format name is marked with the RedHat logo, its original design concept is open, including OpenLinux, S.u.S.E. and Turbo Linux and other Linux distributions are used.

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