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If a problem is suspected in the file system, use the fsck command to inspect the file system.When the fsck command is executed, it will check the file system for abnormalities, and if any abnormalities are found, it will display a return value depending on the nature of the problem.If no abnormality is found, the number of files contained on the disk, the number of blocks in use, and the number of available blocks will be displayed.If the command is executed with no arguments, all devices described in /etc/fstab will be scanned, and if the command is executed with a device name specified as an argument, only the specified device will be scanned.Caution.Since disk access while the check is in progress may destroy the system, it is safe to unmount any volume that can be unmounted when executing the fsck command, and to run it in single-user mode if it contains a volume on which / is placed.

Use the e2fsck command to check the consistency of the file system for ext2 (Linux 2nd extended file system) and ext3 (Linux 2nd extended file system with journal and automatic record keeping).Specify the device name of the volume to be checked as an argument.Caution.Since disk access while the inspection is in progress may destroy the system, it is safe to unmount any volume that can be unmounted when running the e2fsck command, and to run it in single-user mode if it contains a volume with / placed on it. Also, root privileges are required to run this e2fsck command.

Check the status of the SCSI host adapter.To find out the manufacturer, model name, model number, and connection status of the SCSI card in a system with a SCSI card installed, you can check the status of the SCSI card by viewing the information in the "/proc/scsi/scsi" file.

I/O address informationOn Linux systems, you can display the memory map of the CPU reserved for I/O devices.To display the information, refer to the /proc/ioports file.You can use the more or less command to see the screen transition.