In CentOS check if a package is installed

To check if a package is installed on CentOS, you can use the rpm command or the yum package manager. Here are two methods to check for the presence of a package:

Using the rpm Command:

You can use the rpm command to query the RPM database for installed packages. Replace package-name with the name of the package you want to check:

rpm -q package-name

For example, to check if the rsyslog package is installed, you can run:

rpm -q rsyslog

If the package is installed, it will display its version information. If it's not installed, there will be no output.

Using the yum Command:

You can also use the yum command to check if a package is installed. Replace package-name with the name of the package you want to check:

yum list installed package-name

For example, to check if the rsyslog package is installed, you can run:

yum list installed rsyslog

If the package is installed, it will display its version information and other details. If it's not installed, there will be no output.

These methods allow you to verify whether a package is installed on your CentOS system.

references:

OpenAI