Re^3: How does $. work in one liner? -- it does not reset automatically

#cat a.txt
a file line 1
...
b file line 1
b file line 2
b file line 3

#perl -ne "print if 1..2" a.txt b.txt
a file line 1
a file line 2

#perl -ne "print if 1..2; close ARGV if eof" a.txt b.txt
a file line 1
a file line 2
b file line 1
b file line 2

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