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

$( The real gid of this process. If you are on a machine that supports membership in multiple groups simultaneously, gives a space separated

$LAST_PAREN_MATCH

HANDLE->input_line_number( EXPR )

${^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

$FORMAT_PAGE_NUMBER

$. Current line number for the last filehandle accessed. Each filehandle in Perl counts the number of lines

$^I The current value of the inplace-edit extension. Use

$< The real uid of this process. You can change both the real uid and the effective uid at the same time by using

$OUTPUT_RECORD_SEPARATOR