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Perl variables

$\!	Status from most recent system call (including I/O)
$“	List separator for array interpolation
$\#	Output number format \[deprecated: use printf() instead\]
$$	Process ID
$%	Page number of the current output page
$&	Most recent regex match string
$’	String following most recent regex match
$(	Real group ID of the current process
$)	Effective group ID of the current process
$\*	Regex multiline matching flag \[removed: use /m instead\]
$,	Output field separator for print() and say()
$-	Number of lines remaining in current output page
$.	Line number of last input line
$/	Input record separator (end-of-line marker on inputs)
$0	Program name
$1	First capture group from most recent regex match
$2	Second capture group from most recent regex match
$3	Third capture group from most recent regex match
$4	Fourth capture group from most recent regex match
$5	Fifth capture group from most recent regex match
$6	Sixth capture group from most recent regex match
$7	Seventh capture group from most recent regex match
$8	Eighth capture group from most recent regex match
$9	Ninth capture group from most recent regex match
$+	Final capture group of most recent regex match
$:	Break characters for format() lines
$;	Hash subscript separator for key concatenation
$\<	Real uid of the current process
$=	Page length of selected output channel
$\>	Effective uid of the current process
$?	Status from most recent system call (including I/O)
$@	Current propagating exception
$ARGV	Name of file being read by readline() or \<\>
$\[	Array index origin [deprecated]
$\	Output record separator (appended to every print())
$\]	Perl interpreter version [deprecated: use $^V]
$\\		Name of top-of-page format for selected output channel
$^A	Accumulator for format() lines
$	C	Is the program still compiling?
$	D	Debugging flags
$	E	O/S specific error information
$	F	Maximum system file descriptor
$	H	Internal compile-time lexical hints
$	I	In-place editing value
$	L	Form-feed sequence for format() pages
$	M	Emergency memory pool
$	N	Most recent capture group (within regex)
$	O	Operating system name
$	P	Internal debugging flags
$	R	Result of last successful code block (within regex)
$	S	Current eval() state
$	T	Program start time
$	V	Perl interpreter version
$	W	Global warning flags
$	X	Perl interpreter invocation name
$\_	Topic variable: default argument for matches and many builtins
$\`	String preceding most recent regex match
${	CHILD\_ERROR\_NATIVE}	Native status from most recent system call
${	ENCODING}	Encode object for source conversion to Unicode
${	GLOBAL\_PHASE}	Current interpreter phase
${	MATCH}	Most recent regex match string (under /p)
${	OPEN}	PerlIO I/O layers
${	POSTMATCH}	String following most recent regex match (under /p)
${	PREMATCH}	String preceding most recent regex match (under /p)
${	RE\_DEBUG\_FLAGS}	Regex debugging flags
${	RE\_TRIE\_MAXBUF}	Cache limit on regex optimizations
${	TAINT}	Taint mode
${	UNICODE}	Unicode settings
${	UTF8CACHE}	Internal UTF-8 offset caching controls
${	UTF8LOCALE}	UTF-8 locale
${	WARNING\_BITS}	Lexical warning flags
${	WIN32\_SLOPPY\_STAT}	Use non-opening stat() under Windows
$		Autoflush status of selected output filehandle
$\~	Name of format for selected output channel
%\!	Status of all possible errors from most recent system call
%+	Named captures of most recent regex match (as strings)
%-	Named captures of most recent regex match (as arrays of strings)
%ENV	The current shell environment
%INC	Filepaths of loaded modules
%SIG	Signal handlers
%	H	Lexical hints hash
@+	Offsets of ends of capture groups of most recent regex match
@-	Offsets of starts of capture groups of most recent regex match
@ARGV	Command line arguments
@F	Fields of the current input line (under autosplit mode)
@INC	Search path for loading modules
@\_	Subroutine arguments