How to check whether the specified software has been installed in centos system

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 the following command to check.

rpm -qa | grep "软件或者包的名字"

2. The deb package is installed and can be seen using dpkg -l. If you are looking for a specific software package, use the following command to view it.

dpkg -l | grep "软件或者包的名字"

(Recommended tutorial: centos usage tutorial)

3. If it is installed by yum method, you can use yum list installed to find it. If you are looking for a specified package, add after the command | grep "Software name or package name";

For example:

yum list installed openssl |grep openssl
openssl.x86_64                     1:1.0.2k-8.el7                      @anaconda

If there is no return value, it means it is not installed.

4. If the source code package is compiled and installed by yourself, such as in the form of .tar.gz or tar.bz2, you can only check whether the executable file exists.

Neither of the above two methods can see the package installed in this source code form. If installed as the root user, the executable programs are usually in the /sbin:/usr/bin directory.

5. To view all packages installed by pip, the command is as follows:

pip list

Recommended related video tutorials: linux video tutorial

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