$EVAL_ERROR
${^LAST_FH} This read-only variable contains a reference to the last-read filehandle. This is set by
IO::Handle->format_line_break_characters EXPR
%OS_ERROR
$UID
ARGV The special filehandle that iterates over command-line filenames in @ARGV . Usually
$FORMAT_LINES_LEFT
$ARG
HANDLE->format_page_number(EXPR)
$SYSTEM_FD_MAX
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