A small change gives the requested numerical file names:
    split -d1a 4 /path/to/input_file.txt subfile
Still not exactly as specified since the names will be zero-padded but it keeps them sorting alphanumerically ... and that's probably better anyway.

OK, this ain't Perl but a one-liner is a one-liner.

In reply to Re^2: loop da loop chomp chomp loop chomp blurp oops by igelkott
in thread loop da loop chomp chomp loop chomp blurp oops by frenchcr

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