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I want a global setting for Mathematica that changes the default directory to the current folder where the Mathematica's file therein. When I want to change the directory to the current folder, I use SetDirectory[NotebookDirectory[]] command at the top of my code to change the directory. Is there any global setting in Mathematica that changes the directory to a current folder where the Mathematica file exists there?

AYBRXQD
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    The problem is that you can open the notebook without starting the kernel. And current directory is a kernel's setting. You / the FrontEnd can also start the kernel without any particular notebook or with a non saved notebook. So there are many 'buts' with SetDirectory when Mathematica starts. Shortly, you can edit init.m file but NotebookDirectory[] may not be available and you will often get annoying messges. – Kuba Aug 16 '19 at 07:00
  • Dear @Kuba, If want to apply SetDirectory[NotebookDirectory[]] command when the kernel starts, what shall I do? – AYBRXQD Aug 16 '19 at 07:02
  • You can append it to your Kernel/init.m file, see https://mathematica.stackexchange.com/a/63741/5478 – Kuba Aug 16 '19 at 07:26
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    The problem is that there is no NotebookDirectory[] when the kernel starts. As an example create a new notebook without saving it and issue the SetDirectory command and you will see what I mean. – Bill Watts Aug 16 '19 at 07:31

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