$~ The name of the current report format for the currently selected output channel. The default format name is the same as the filehandle name

${^GLOBAL_PHASE} The current phase of the perl interpreter. Possible values are:

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

${^POSTMATCH} This is similar to $' ($POSTMATCH

$FORMAT_PAGE_NUMBER

@LAST_MATCH_START

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

$OUTPUT_RECORD_SEPARATOR

HANDLE->format_top_name(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