Types Expressions Variables Reserved Words （表达式类型变量保留字）.pdf

Predefined Variables Ruby arguments $! Exception information -c Check $@ Array of backtrace -d Debug $ String of last match -e One Line $` String left of last match -h Help $‘ Str right of last match -n gets loop Types Expressions Variables $+ Last group of last match -rL require L 12345 if expr [then] local $N Nth group of last match -v verbose elsif expr 123.45 @instance $~ Info about last match -w warnings [then] 1.23e-4 else @@class $= Case insensitive flag -y comp debug end 0xFF00 CONSTANT $/ Input record separator 0b01100 unless expr $\ Output record separator Reserved Words [then] 1..5 else Operators and $, Output field separator alias end Precedence 1...5 $. Line number of last file and ‚a‘..‘z‘ expr if expr :: $ Default output BEGIN ‚a‘...‘z‘ expr unless [] $_ Last input line of string begin expr ** ‚string sq‘