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Hi David,
The awk command l=length($1) sets l to the number of characters in the first field. In your example, this sets l to 35 because there are 35 characters in...

The printf utility is not unique to bash; it is a standard utility present on any system that supports the common set of utilities defined by the POSIX standards and the Single UNIX Specification. ...

I think for some awks it is ambiguous what is the target of the redirection. To remove this ambiguity, you could either assign the composition of the filename to a variable first, like I suggested,...

The trouble is with:
{ print $0 >> i".txt" }
Try:
{ f=i ".txt"; print>f }

I'm not sure about OSX.

I tested this code in following systems and it works fine


gawk in GNU/Linux

awk in HP-UX

/usr/xpg4/bin/awk in SunOS