Parse SMART Monitor test results for bad sector count, drive info.

smarty_pants.sh

#!/usr/bin/env bash
#
# smarty_pants
#
# Parse SMART Monitor test results for bad sector count, drive info.
#
# Author: M. Krinitz <mjk235 [at] nyu [dot] edu>
# Date: 04-AUG-2025
# License: MIT
host="$(hostname --fqdn)"
timestamp="$(date +"%b %d %X")"

to=""
cc=""
from=""
subject="SMART_Test_Results@$host"

mail_cmd="mail -s $subject -r $from -c $cc $to"

# Glob regex pattern match to find hard disk drive(s)--HDD(s).
drives=(/dev/[sh]d[a-z]*)

# Check yo privilege.
root_check() {
  if [ "$EUID" != "0" ] ; then
    printf "%s\n" "Root privileges required. Exiting."
    exit 1
  fi
}

# Check if `smartctl` command exists on system.
smart_binary_check() {
  if ! command -v smartctl &> /dev/null; then
    printf "%s\n" "SMART Monitoring Tools NOT installed. Exiting."
    exit 1
  fi
}

# Check if HDD(s) have SMART capability.
smart_capability_check() {
  if smartctl --info "$disk" \
    | grep --word-regexp --ignore-case --quiet "device lacks SMART capability."; then
    return 1
  fi
}

# Enable SMART on drive.
smart_enable() {
  smartctl --smart=on --quietmode=silent --device=ata "$disk"
}

# Parse SMART report for bad sector count. If count != zero (0), warn me.
smart_bad_sector_count() {
  local disk="$1"
  local count
  count=$(smartctl --all --device=ata "$disk" | awk '/Reallocated_Sector_Ct/ {print $NF}')

  if [[ -z "$count" ]]; then
    printf "%s\n" "SMART status: Unable to determine bad sector count on: $disk"
    return
  fi

  if [[ "$count" != "0" ]]; then
    printf "%s\n" "SMART status: ---WARNING!!!--- $count BAD SECTORS DETECTED on: $disk!!!"
  else
    printf "%s\n" "SMART status: No problems detected on: $disk."
  fi
}

# Parse SMART info for:
# Model Family, Device Model, Serial Number, User Capacity.
smart_info() {
  local disk="$1"
  printf "%s\n" ""
  smartctl --info --device=ata "$disk" | \
    grep -E 'Model Family|Device Model|Serial Number|User Capacity'
  printf "%s\n" ""
}

# Get retrieval value.
exit_status() {
  printf "%s\n" $retVal
  if [[ "$retVal" -ne 0 ]]; then
    printf "%s\n" "ACHTUNG!!! Something went wrong, homie."
  else
    printf "%s\n" "Done. Exiting @ $timestamp."
  fi
}

# Wrapper function. Pipe standard ouput to email.
main() {
  root_check
  smart_binary_check
  printf "%s\n" "SMART report for: $host@$timestamp"
  for disk in "${drives[@]}"; do
    printf "%s\n" "----------"

    if ! smart_capability_check "$disk"; then
      printf "%s\n" "$disk is NOT SMART capable. Skipping."
      continue
    fi

    smart_enable "$disk"
    smart_bad_sector_count "$disk"
    smart_info "$disk"
  done
}

main "$@" | $mail_cmd

retVal=$?
exit_status