Read important SMART device attributes
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read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementssmartctlsmartctl must be installed and available on PATH.
Version supportsmartctl Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalsID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUERepresentative successful output; values vary with the selected target and system state.
Known errorssmartctl: command not foundsmartctl is missing or is not available on PATH.
Verifysmartctl -A {{device}}The 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
01smartctlCommandRuns the smartctl stage of this one-liner.
02-AOptionConfigures smartctl with the -A option.
03<device>ParameterA value supplied in the Fill parameters section.
Example input
smartctl -A /dev/sda
Example output
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
194 Temperature_Celsius 0x0022 058 051 000 Old_age Always - 42
Illustrative output — exact values vary by system and data.
Official sources