Read memory utilization history
Build a paste-ready command, then review its compatibility and effects before running it.
read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementssarsar must be installed and available on PATH.
Version supportsar Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signals12:10:01 AM kbmemfree kbavail kbmemused %memused kbbuffers kbcachedRepresentative successful output; values vary with the selected target and system state.
Known errorssar: command not foundsar is missing or is not available on PATH.
Verifysar -rThe output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01sarCommandRuns the sar stage of this one-liner.
02-rOptionEnables raw, recursive, or reverse mode for this command.
Example output
12:10:01 AM kbmemfree kbavail kbmemused %memused kbbuffers kbcached
12:10:01 AM 842112 1428812 1780100 52.1 126720 1180240
Illustrative output — exact values vary by system and data.
Official sources