Learning Linux: How to Use Signal Commands for Checking System Status（linux查看信号命令）

Linux is a powerful operating system that many computer users use to complete their daily tasks. Its popularity is due to its great stability, security and efficiency. As a Linux user, one of the most important skills you must have is the ability to use signal commands, which are built-in commands that provide information regarding the status of your system. These commands can help you ensure that your system is running smoothly and quickly address any issues.

The first signal command you should familiarize yourself with is top. This command displays information about the processes that are currently running on your system, including the process name, CPU usage and memory usage. With this information, you can see whether or not any processes are hogging system resources and terminate them if necessary.

The second signal command you should learn is uptime, which will tell you how long your Linux system has been running since it was last booted up. This information is important because it will give you an idea of the health and stability of your system, and it can alert you to any problems that may need attention.

The third signal command you should be aware of is df (disk free). When run, this command will provide an overview of the disks that are connected to your system, along with their respective sizes and the amount of free space available to each. Knowing the total size and available space of your disks can be useful for planning storage needs and ensuring optimum system performance.

Finally, you should consider learning the command ps (processes). This command will list all active processes, implying those associated with users and system services. In combination with the top command, this command can help you identify services and processes that are non-essential and terminate them accordingly.

Using these signal commands can help you to manage your Linux system effectively and improve its performance. While you can find out additional information about these commands from the manual page of each command, the best way to become familiar with them is to practice. So, take some time to practice using the signal commands listed here and familiarize yourself with the other commands available to you.