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#!/usr/bin/env sh

...

    END { print $f_max_line // "No line with number found.\n" }
'

#!/usr/bin/env sh

...
    -wne 'print max(/$RE{num}{real}/g) // "NaN", " : ", $_'  |
    sort -k1nr | head -1 |
    sed 's/^NaN :.*$/No line with number found./;s/^[0-9-]* : //'