Theshow flash:command is used todisplay the contents of the device's flash memory, which is where the Cisco IOS image is typically stored. By issuing this command, a technician can verify available space and determine whether there is enough capacity to accommodate a new IOS image before initiating an upgrade or image replacement process.
This command provides a detailed listing of files, their sizes, and the total and available memory space within the flash file system.
show file-systemlists all available file systems but doesn’t detail their content.
show memoryshows runtime memory usage (RAM), not flash memory.
show storageis not a standard IOS command.
[Reference:Supporting Cisco Devices for Field Technicians (FLDTEC) – Cisco IOS Software Basics, ===========]
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