Introduction to Shell Scripting: Automating Tasks on Linux Servers

Shell scripts are automated execution tools in Linux that write commands into a text file in sequence to replace repetitive manual operations and improve efficiency. They are essential skills for server management. Their basic syntax includes variable assignment (no spaces around the equals sign), conditional judgment (if-else), and loops (for/while). The first "Hello World" script requires defining variables, adding execution permissions (chmod +x), and running the script. Practical scripts, such as disk monitoring, extract the root partition usage rate using commands like `df -h` and trigger an alert when it exceeds 80%. Precautions: Execute permission must be granted before running, no spaces in variable assignment, and use `./` to specify the current directory when executing. Learning can start with basic exercises, and after mastering variables, conditions, and loops, one can advance to learning `crontab` for scheduled tasks to achieve automated operations and maintenance.