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Showing content from https://doc.rust-lang.org/nightly/std/fs/fn.rename.html below:

rename in std::fs - Rust

pub fn rename<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> Result<()>

Renames a file or directory to a new name, replacing the original file if to already exists.

This will not work if the new name is on a different mount point.

This function currently corresponds to the rename function on Unix and the MoveFileExW or SetFileInformationByHandle function on Windows.

Because of this, the behavior when both from and to exist differs. On Unix, if from is a directory, to must also be an (empty) directory. If from is not a directory, to must also be not a directory. The behavior on Windows is the same on Windows 10 1607 and higher if FileRenameInfoEx is supported by the filesystem; otherwise, from can be anything, but to must not be a directory.

Note that, this may change in the future.

This function will return an error in the following situations, but is not limited to just these cases:

• from does not exist.
• The user lacks permissions to view contents.
• from and to are on separate filesystems.

use std::fs;

fn main() -> std::io::Result<()> {
    fs::rename("a.txt", "b.txt")?; Ok(())
}

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