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Alternative names for Perl system variables

Variable                Alternative name(s)  $_ $                    ARG  $0                      $PROGRAM_NAME  $<                      $REAL_USER_ID or $UID  $>                      $EFFECTIVE_USER_ID or $EUID  $(                      $REAL_GROUP_ID or $GID  $)                      $EFFECTIVE_GROUP_ID or $EGID  $]                      $PERL_VERSION  $/                      $INPUT_RECORD_SEPARATOR or $RS  $\                      $OUTPUT_RECORD_SEPARATOR or $ORS  $,                      $OUTPUT_FIELD_SEPARATOR or $OFS  $"                      $LIST_SEPARATOR  $#                      $OFMT  $@                      $EVAL_ERROR  $?                      $CHILD_ERROR  $!                      $OS_ERROR or $ERRNO  $.                      $INPUT_LINE_NUMBER or $NR  $*                      $MULTILINE_MATCHING  $[                      none (deprecated in Perl 5)  $;                      $SUBSCRIPT_SEPARATOR or $SUBSEP  $:                      $FORMAT_LINE_BREAK_CHARACTERS  $$                      $PROCESS_ID or $PID  $^A                     $ACCUMULATOR  $^D                     $DEBUGGING  $^F                     $SYSTEM_FD_MAX  $^I                     $INPLACE_EDIT  $^L                     $FORMAT_FORMFEED  $^P                     $PERLDB  $^T                     $BASETIME  $^W                     $WARNING  $^X                     $EXECUTABLE_NAME  $&                      $MATCH  $'                      $PREMATCH  $'                      $POSTMATCH  $+                      $LAST_PAREN_MATCH  $~                      $FORMAT_NAME  $=                      $FORMAT_LINES_PER_PAGE  $-                      $FORMAT_LINES_LEFT  $^                      $FORMAT_TOP_NAME  $|                      $OUTPUT_AUTOFLUSH  $%                      $FORMAT_PAGE_NUMBER