How to check whether a certain software is installed in CentOS

How to check whether a certain software is installed in CentOS

1. If the rpm package is installed, you can use rpm -qa to see it. If you want To find out whether a certain software package is installed, use

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rpm -qa | grep "软件或者包的名字"

2. If it is installed by yum method, you can use yum list installed to find it. If you want to find the specified Package, add | grep "software name or package name" after the command;

yum list installed | grep "软件名或者包名"

3. If you compile and install the source code package yourself, such as .tar.gz or tar.bz2, this can only be viewed Does the executable file exist, for example

whereis mysql
whereis php
whereis nginx

Note: If installed as root user, the executable program is usually in the /sbin:/usr/bin directory

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