TestOut Linux Pro Practice Test 2025 – Complete Exam Prep Guide

To view all installed modules in Linux, the appropriate command is **lsmod**. This command provides a list of the currently loaded kernel modules along with additional information such as the memory size and any dependencies among the modules. When you execute lsmod, it reads from the /proc/modules file, which contains this detailed information about the modules currently in use by the kernel.

The other options serve different purposes: **modinfo** is used to display detailed information about a specific module, including version and parameters, but it does not list all modules. **modprobe** is a tool for adding or removing modules from the kernel; it does not display installed modules. Lastly, **showmod** is not a recognized command in standard Linux distributions for managing or viewing kernel modules.

Therefore, lsmod is the command that fulfills the requirement of viewing all installed modules in the Linux environment.