You have just hot-plugged additional RAM into a production Linux server. For your change-management ticket you need a concise report that shows only the aggregate totals (Total, Online, Offline) and omits every individual memory-block line. Which single lsmem option will give you exactly that output?
--summary
--summary=never
--all
--summary=always
The option --summary enables lsmem's summary mode. When the optional argument is omitted, the utility defaults to the value only, so it prints the summary lines (Total, Online, Offline) and suppresses the detailed list of memory-block ranges. --summary=always would still print the summary but also keeps the full block listing, --summary=never removes the summary entirely, and --all forces lsmem to list every individual memory block, doing the opposite of what is required.
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