What does the command 'diagnose system print df' show?

The command 'diagnose system print df' is used within Fortinet devices, such as FortiGate and FortiAnalyzer, to display the disk space usage of various file systems on the device. It shows information about the total size, used space, and available space for each mounted file system. Understanding file system utilization is crucial for monitoring the device's health and performance, as it allows administrators to ensure that there is adequate space for logging, reports, and system operations, which can directly impact the overall effectiveness of the security appliance. Thus, the command directly correlates to checking the file system disk space usage.