How to check whether a certain software is installed in linux

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 rpm -qa | grep "software Or the name of the package "

rpm -qa | grep perl

2. If installed with deb package, you can use dpkg -l to see it. If you are looking for a specified software package, use dpkg -l | grep "the name of the software or package"

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dpkg -l | grep perl
-bash: dpkg: command not found

3. If installed using the yum method, you can use yum list installed to search. If you are looking for a specified package, use yum list installed | grep "software name or package name"

yum list installed | grep perl

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