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$! # Lastest error message

$@ # Location of error

$_ # String last read by `gets`

$. # Line number last read by interpreter

$& # String last matched by regexp

$~ # The last regexo match, as an array of subexpressions

$n # The nth subexpressions in the last match (like as `$~[n]`)

$= # Case-insensitivity flag

$/ # Input record separator

$\ # Output record separator

$0 # The name of the ruby script file

$* # The command line arguments

$$ # Interpretter's process ID

$? # Exit status of last executed child process