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What does the command ./ mean? For example, sometimes we call a file with ./config, sometimes ../config, thanks

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marked as duplicate by Florian Diesch, Warren Hill, Seth, Braiam, Radu Rădeanu Oct 13 '13 at 19:47

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There almost certainly is a duplicate out there @Joren but in this case, that isn't a good one as it doesn't really explain anything about why it's required for executing things. Edit: Hmm maybe I'm making a bad assumption about it being executable. –  Oli Oct 13 '13 at 18:21
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./some_file means run some_file in the current directory. ../some_file means run some file in the parent directory. Perhaps this question explains it better: Why do I need to type ./ before executing a program in the current directory? –  Warren Hill Oct 13 '13 at 18:47

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./config means you're calling something in the current working directory. In this case config is an executable. You have to specify the path for executables if they're outside your $PATH variable and that's why config isn't enough.

../config would be used if the config executable were in the parent of the current working directory.

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