another data point: perl

How Perl detects binary/text files:

"The -T and -B switches work as follows. The first block or so of the
file is examined for odd characters such as strange control codes or
metacharacters. If too many odd characters (>10%) are found, it's a -B
file, otherwise it's a -T file. Also, any file containing null in the
first block is considered a binary file."

   - from http://www.cs.cmu.edu/Web/People/rgs/pl-exp-op.html
     (found by Greg Stein)

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Received on Sat Oct 21 14:36:35 2006