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This question already has an answer here:

I'm making a 1.12 map that need to do something when a player join. I tried stats.leavegame method, but if the game crashed the last time, the command won't run.

No file permission for it's hard to share, but unintended file type (like using a file to take the place of a folder, in my answer) is fine

marked as duplicate by Virusbomb, B. S. Morganstein, Gigazelle, Dragonrage, galacticninja Aug 13 at 5:51

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    Yay, someone who shows what they tried before! – Fabian Röling May 9 '18 at 8:59
  • So you want to detect every join, not just the first, right? There are certainly ways to detect when the player is there or not, but I'm trying to find a not very laggy, elegant way. I have some ideas already, I'll try some things in the next hours, for example if scoreboard tag on offline players can be used here. – Fabian Röling May 9 '18 at 9:04
  • @Fabian Using tag seems can only detect players except the first one – l4m2 May 9 '18 at 11:39
  • @Virusbomb Checked the dup source, it assumes on a server, so if it crashes a local fix can be done; Here is a map where you shouldn't require to do something just because of unnormal shutdown – l4m2 Aug 13 at 16:39
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Self solved , experiment under discussion with chyx

The world loads before player join even if it's single player, so freely assume at the beginning there's no player:

give @a[score_onLine=0] iron_shovel
scoreboard players set * onLine 0
scoreboard players set @a onLine 1

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