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Use awk variables. Assuming $n and $m are shell variables:
var=$(awk -v line="$m" -v field="$n" 'NR==line{print $field}' input_file)

The avobe explanation is correct, for delimeter in awk use -F and use the value of "nth" filed. For runtime variable assing that variable also. using -v option.
awk -vvar=5 -F" " 'NR==10 {print...