What is the cmd to setup sourcetree with diffmerge for 3-way merges?

While browsing I found some hints on how to invoke a 3-way merge for diffmerge:

  • https://answers.atlassian.com/questions/156961/setting-up-custom-merge-tool-in-sourcetree
  • http://twobitlabs.com/2011/08/install-diffmerge-git-mac-os-x/

But nothing as simple as a command that should sit in sourcetree’s configuration and just works:
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  • One Solution collect form web for “What is the cmd to setup sourcetree with diffmerge for 3-way merges?”

    You’re looking for the merge.conflictstyle git config setting. If you’d like to apply this setting to all of your repositories, run:

    git config --global merge.conflictstyle diff3
    
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