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  1. or download this
    cat file1
echo ---
cat file2
  2. or download this
    ...
--- perl output to stdout ---
...
line3
line1
line2
  3. or download this
    perl -i -pe '$f||=s/opt=.*/opt=bar/; $_.="opt=bar\n" if !$f && !@ARGV 
+&& eof' files...