Why do we say Shalom Aliechem in Kiddush Levanah? And what should one do if there are no other people around (or not enough people around)?
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The Original sorce for this Minhag is a Maseches Sofrim.
The reasons given are:
In response to what to do if there is not enough people around the Mateh Moshe says you greet one person three times. The Rebbe of the Mahril say that if you have three people you say to one friend twice ‘Shalom Aleichem’ and to the other once.
Since the first question was answered already I will address the second one only.
The Avnei Yashfei 3:50:3 writes that if one says kiddush levana alone there is no inyan to search out for someone to say shalom aleichem since he said the passuk Tipal aleiheim and no one heard him(see @simchas Torah answer -Mattaeh Moshe reason).He adds by saying if one said it with a tzibbur even though he said that passuk quietly ,the fact that the tzibbur knows he says the passuk he still should say shalom aliechem.
You wouldn't say it on your own, but you can say it after Kiddush Levana to the first three people you meet. (I was advised this in my youth.)