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I'm not sure what you mean by an IBM application, but in a ksh or bash script, the code:sed '1d' file1 > file1.$$ && mv file1.$$ file1
seems to be pretty concise.

Or much more simply:
var=$(nzodbcsql -q "select max(million_cnt) from tablename";)
awk 'NR == 4{ print $1; exit }' <<<"${var}"