$OUTPUT_RECORD_SEPARATOR

HANDLE->input_line_number( EXPR )

$FORMAT_PAGE_NUMBER

@F The array @F contains the fields of each line read in when autosplit mode is turned on

${^UTF8CACHE} This variable controls the state of the internal UTF-8 offset caching code. 1 for on (the default), 0 for off, -1 to debug the

$^R The result of evaluation of the last successful (?{ code }) regular expression assertion (see

$EFFECTIVE_GROUP_ID

$^E Error information specific to the current operating system. At the moment, this differs from $!

@_ Within a subroutine the array @_ contains the parameters passed to that subroutine. Inside

$SUBSCRIPT_SEPARATOR