mysql -uroot -p -e 'SHOW VARIABLES WHERE Variable_Name LIKE "%dir"'
if you want only the data dir use:
mysql -uroot -p -e 'SHOW VARIABLES WHERE Variable_Name = "datadir"'
mysql -uroot -p -e 'SHOW VARIABLES WHERE Variable_Name LIKE "%dir"'
if you want only the data dir use:
mysql -uroot -p -e 'SHOW VARIABLES WHERE Variable_Name = "datadir"'