Ruby

#
{:.-one-column}

| Code                    | Description                                               |
| ----------------------- | --------------------------------------------------------- |
| `$!`                    | latest error message                                      |
| `$@`                    | location of error                                         |
| `$_`                    | string last read by gets                                  |
| `$.`                    | line number last read by interpreter                      |
| `$&`                    | string last matched by regexp                             |
| `$~`                    | the last regexp match, as an array of subexpressions      |
| `$n`                    | the nth subexpression in the last match (same as `$~[n]`) |
| `$=`                    | case-insensitivity flag                                   |
| `$/`                    | input record separator                                    |
| `$\`                    | output record separator                                   |
| `$0`                    | the name of the ruby script file                          |
| `$*` (or `ARGV`)        | the command line arguments                                |
| `$$`                    | interpreter's process ID                                  |
| `$?`                    | exit status of last executed child process                |
| `$-i` `$-l` `$-p` `$-v` | Command line switches                                     |
| `$-v` (or `$VERBOSE`)   | verbose mode                                              |


Code	Description
`$!`	latest error message
`$@`	location of error
`$_`	string last read by gets
`$.`	line number last read by interpreter
`$&`	string last matched by regexp
`$~`	the last regexp match, as an array of subexpressions
`$n`	the nth subexpression in the last match (same as `$~[n]`)
`$=`	case-insensitivity flag
`$/`	input record separator
`$\`	output record separator
`$0`	the name of the ruby script file
`$*` (or `ARGV`)	the command line arguments
`$$`	interpreter’s process ID
`$?`	exit status of last executed child process
`$-i` `$-l` `$-p` `$-v`	Command line switches
`$-v` (or `$VERBOSE`)	verbose mode

Ruby Cheat Sheet in April 2024

Last Updated: 20 April 2024

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