I too suspect that it should be shell's limitation.

"too"? I didn't mention the shell at all, but I suppose it could also be the shell's fault.

what actually is the line doing

The first perl creates a long string which is sent to the second perl's STDIN as if someone had typed it. It shows that Perl has no problem reading a line one million bytes long.

In reply to Re^3: Problem with STDIN input by ikegami
in thread Problem with STDIN input by Gyatso

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