e2undo:tldr:4993e

The e2undo command is used to restore a filesystem to a previous state by undoing the changes made to it.

Let's break down the provided command: e2undo -nv ${path-to-undo_file} ${-dev-sdXN}

1. e2undo: This is the name of the command itself.
2. -nv: These are options or flags that modify the behavior of the command.
   • -n: Specifies that the command should run in non-interactive mode, without asking for confirmation.
   • -v: Enables verbose mode, which provides more detailed output during the process.
3. ${path-to-undo_file}: This is a placeholder for the actual path to the undo file. You need to replace it with the correct path to the file you want to use for undoing the changes.
4. ${-dev-sdXN}: This is another placeholder that represents the device identifier or path for the filesystem you want to restore. You need to replace it with the actual device identifier or path.

In summary, the command e2undo -nv ${path-to-undo_file} ${-dev-sdXN} runs the e2undo command in non-interactive mode with verbose output. It requires specifying the path to the undo file and the device identifier or path of the filesystem you want to restore.