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I found that in a website 〜やんな is a colloquial form of 〜やるな meaning 'Don't do...'
However, I have seen the word in a manga with the following sentence.
A: おい あかりを消してやんな。新入りさんがまぶしくてねむれんといかん。
B: じゃあ 消すぜ
While B speaking, he also turning off the light. So, is the word can be both positive and negative?
The particle な indeed has both meanings: "Don't do ～" and "Do ～". From デジタル大辞泉:
- １ 動詞・動詞型助動詞の終止形、ラ変型活用語の連体形に付く。禁止の意を表す。「油断する―」「まだ帰る―」「かの尼君などの聞かむに、おどろおどろしく言ふ―」〈源・夕顔〉
- ２ 《補助動詞「なさる」の命令形「なさい」の省略形》動詞・動詞型助動詞の連用形に付く。命令の意を表す。「早く行き―」「好きなようにやり―」
To distinguish, な means "Don't" when it follows the dictionary-form, and "Do" when it follows the masu-stem.
Using な in positive instead of negative imperative (e.g. 行きな)
Confusingly, やんな can work as the colloquial form of either やりな or やるな. (やり is the masu-form of やる, which is the subsidiary verb meaning "(do something) for someone" or "Dare do something"). So 消してやんな can both either "Turn it off (for someone)" or "Don't turn it off".
But these can be distinguished by their accents:
Similar examples:
This type of ambiguous colloquial form is found in all ラ行 consonant-stem verbs (走る, 座る, 頑張る, ...).
EDIT: To make sure, 消してやんな in 「あかりを消してやんな。新入りさんがまぶしくてねむれんといかん。」 is 消してやりな. If it were something like 「あかりを消してやんな。新入りさんはまだ勉強がしたいんだ。」 then it would mean 消してやるな. It's purely context-dependent, and I can't tell which is generally more common even after googling 座んな, 走んな, 帰んな, 乗んな, etc.
This してやんな is a euphonic change of してやりな. Verb + してやる means "do something for somebody" so 明かりを消してやんな is translated as "Turn off the light (for the freshman)."
In addition, this word also can indicate negative imperative as you noticed.
They can be distinguished by their accents and contexts.
I think that in this case 消してやんな is a version of the Tokyo-ben「やりな」
It would be meant as, "*Turn off the lights for them." (light command)
やらなかん <- Do you mean 「やらなあかん」? In that case, we'd say [消してやらな]{HHHHHL} or [消したらな]{HHHHL}, not [消してやんな]{LHHHHH}
Kansai-ben「やらなかん」 but I think it's a typo or error for やらなあかん, and (2) I know してやんな is common, and it's a contracted form of してやりな(さい) , not してやらな(あかん). So I am saying that your line (消して)やんな is a version of the Kansai-ben「やらな(あ)かん」 is incorrect. I said 消してやらな and 消したらな are short for やらなあかん, and やらなあかん doesn't get shortened to けしてやんな.