Manual page and help for the lsmem linux command. The lsmem command lists the ranges of available memory and their online states. The listed memory blocks correspond to the representation of the memory block in sysf. The command displays the size of the memory block and the amount of memory both online and offline. The default output of progtam is compatible with the original implementation of s390 devices, but it is strongly recommended to avoid using default outputs in our scripts. You should always specify the expected columns with the --output option and list the columns in applications where stable output is essential.