What are your favorite command-line tools for DevOps and how do you use them in your daily workflows

Question

Most command-line tools are needed to ensure that all the processes involved in DevOps streamline themselves. Then, because of automation, a fast deployment of applications occurs along with efficient management of infrastructures. The topic of favorite command-line tools here revolves around which ones professionals currently most engage with from the perspective of functionalities and how they incorporate it into daily workflows for productivity and effectiveness.