2013-10-14 02:36:58 +00:00
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---
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title: Ruby
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2015-11-24 05:02:17 +00:00
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category: Ruby
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2020-07-05 13:13:06 +00:00
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tags: [WIP]
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intro: |
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Quick reference to some features of the Ruby programming language.
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2013-10-14 02:36:58 +00:00
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---
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2012-07-03 08:09:36 +00:00
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2020-07-05 13:13:06 +00:00
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### Reference
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{:.-one-column}
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| Code | Description |
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| ----------------------- | --------------------------------------------------------- |
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| `$!` | latest error message |
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| `$@` | location of error |
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| `$_` | string last read by gets |
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| `$.` | line number last read by interpreter |
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| `$&` | string last matched by regexp |
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| `$~` | the last regexp match, as an array of subexpressions |
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| `$n` | the nth subexpression in the last match (same as `$~[n]`) |
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| `$=` | case-insensitivity flag |
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| `$/` | input record separator |
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| `$\` | output record separator |
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| `$0` | the name of the ruby script file |
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| `$*` (or `ARGV`) | the command line arguments |
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| `$$` | interpreter's process ID |
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| `$?` | exit status of last executed child process |
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| `$-i` `$-l` `$-p` `$-v` | Command line switches |
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| `$-v` (or `$VERBOSE`) | verbose mode |
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