Not always

$ perl -le '{local$/; $_=<>;}print /^[\x00-\xA5]/ ? "binary" : "text" 
+' \
  /mnt/win/WINDOWS/system32/command.com

text

[download]

In reply to Re^2: Detecting 'binary' in a variable by dbwiz
in thread Detecting 'binary' in a variable by kirbyk

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