Besides `Args` given by the user in `std::env`, there are also `Vars` which are the system variables. Those are the basic settings for the program that the user didn't type in. You can use `std::env::vars()` to see them all as a `(String, String)`. There are very many. For example:
```rust
fn main() {
for item in std::env::vars() {
println!("{:?}", item);
}
}
```
Just doing this shows you all the information about your user session. It will show information like this:
So if you need this information, `Vars` is what you want.
## Using files
## Using files
Now that we are using Rust on the computer, we can start working with files. You will notice that now we will start to see more and more `Result`s in our code. That is because once you start working with files and similar things, many things can go wrong. A file might not be there, or maybe the computer can't read it.
Now that we are using Rust on the computer, we can start working with files. You will notice that now we will start to see more and more `Result`s in our code. That is because once you start working with files and similar things, many things can go wrong. A file might not be there, or maybe the computer can't read it.
Dhghomon
4 years ago
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GitHub