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How can I check which application opens a file by extension?

debugcn Published at Dev
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a1an

I am on a debian 9 system with unknown desktop environment (ssh access). How can I find out which program is used by default to view a file with a given extension (e.g. pdf)?

Edit: Since extension is not important to the decision, the mime type of the given file can be found by using file

file -i file.ext
Ignacio Vazquez-Abrams

Ask xdg-mime.

$ xdg-mime query default application/pdf
atril.desktop

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