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Comment by caf | Hacker News Reader

You don't even need the 'smartStats' temporary file at all, since you can do that with just one grep:

  smartctl -a /dev/sda |
    grep '\(Reallocated_Sector_Ct\|Current_Pending_Sector\|Offline_Uncorrectable\|UDMA_CRC_Error_Count\)' > /root/stats

awk is probably better in this case, since you can save only the raw values (and other columns that you deem important):

   awk '/Reallocated_Sector_Ct|Current_Pending_Sector|Offline_Uncorrectable|UDMA_CRC_Error_Count/ {print $2,$10}'