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Ian,

You can use the mris_anatomical_stats command with the -b option. E.g., mris_anatomical_stats -b subjectid lh will give you a tabular output containing the total gray matter volume in the 3rd column:

128449 86239 *243375 *2.588 0.876 0.123 0.026 1496 133.3 /xxx./subjects/QEN001/surf/lh.white

See https://surfer.nmr.mgh.harvard.edu/fswiki/mris_anatomical_stats for more information.

Xiaojiang