git-apply:tldr:3c6ca
The command "git apply --index ${filename}" is used in Git version control system to apply a patch file to the repository's working tree and the index, without committing the changes.
Here's a breakdown of the command:
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"git apply" is the command used to apply a patch file to the repository.
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"--index" is an option that ensures the changes from the patch are not only applied to the working tree but also to the index (staging area).
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"${filename}" is a placeholder for the name of the patch file you want to apply. Replace it with the actual filename (including the path if necessary).
When executing this command, Git will try to apply the changes from the patch file to the repository. If successful, the changes will be reflected in both the working tree and the index. It's important to note that this command doesn't create a new commit, so you'll need to follow up with a commit command if you wish to finalize the changes.