What is the 'dot space filename' command doing in bash?

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Chapters
00:00 Question
00:49 Accepted answer (Score 49)
01:22 Answer 2 (Score 32)
02:30 Answer 3 (Score 6)
03:17 Thank you

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Full question
https://superuser.com/questions/1136409/...

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Tags
#bash #export

#avk47