Here's one to be different: 

echo "1234567890123456" | 
perl -lne 'print"\*"x(length()-4),scalar reverse unpack "A4",reverse'

[download]

gratias vobis ago valeteque
-v.

"Perl. There is no substitute."

In reply to Re: Golf: Replacing part of a string with "*" by Velaki
in thread Golf: Replacing part of a string with "*" by kwaping

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