To view which software packages are installed on the system, you need to use the corresponding commands according to different operating systems. For Ubuntu/Debian systems, you can use dpkg -l to list all installed packages, or extract specific information in combination with awk and grep; you can also use apt list --installed to view. For CentOS/RHEL systems, rpm -qa can be used to view all packages, rpm -q query a single package, or use yum/dnf list installed. Arch Linux uses pacman -Qqe. In addition, you can export the package list to a file for backup or migration, such as dpkg --get-selections > packages.txt, rpm -qa > packages.txt, pacman -Qqe > packages.txt.

Want to know how to check which software packages are installed on your system? In fact, the method is quite straightforward, especially for users using Linux. Different distribution commands may be different, but the overall idea is similar.

How to check installed packages in Ubuntu/Debian system

On systems like Ubuntu or Debian, the most commonly used are dpkg and apt commands. You can use the following methods:

• Use dpkg -l to list all installed packages, including name, version and brief description.
• If you only want to see the package name, you can add a pipe: dpkg -l | awk '{print $2}' .
• Want to check if a specific package is installed? Try dpkg -l | grep 包名.
• You can also use apt list --installed . This command is more intuitive, especially suitable for those who are apt.

These commands can help you quickly locate what is installed in the current system.

How to view installed packages in CentOS/RHEL system

If you are using a Red Hat-based system, such as CentOS or RHEL, it mainly depends on rpm and yum (or a newer dnf ).

• The easiest thing is rpm -qa , which lists all installed rpm packages.
• Want to check a specific package? You can use rpm -q 包名.
• If you want to see if there are any records installed through yum, you can try yum list installed (or dnf list installed if you use dnf).

These commands can basically cover most cases, and the output results are easy to understand.

Other systems or general methods

Some systems are not dpkg or rpm, such as Arch Linux, which uses pacman . At this time, you can use pacman -Qqe to list all installed packages.

In addition, if you want a cross-platform method, you can also consider exporting the entire system package list into the file, which is also convenient for migration or backup in the future. For example:

 dpkg --get-selections > packages.txt # Debian/Ubuntu
rpm -qa > packages.txt # RHEL/CentOS
pacman -Qqe > packages.txt # Arch

Then you can see a text file full of package names.

Basically these are the methods. Different systems have slight differences, but as long as you remember your own system type, the corresponding command will not be difficult to use.

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