feat: Add whoami

This commit adds the `whoami` command.

Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "echo",
     "env",
     "wc",
+    "whoami",
 ]
 
 [workspace.dependencies]

whoami/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "whoami"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { workspace = true }
+users = "0.11.0"

whoami/src/main.rs

@@ -0,0 +1,15 @@
+/// Get the current user
+///
+/// Went the route of using the existing users crate rather than
+/// re-implementing this via the libc crate.
+use users::{get_current_uid, get_user_by_uid};
+
+fn main() {
+    let user = get_user_by_uid(get_current_uid());
+    if let Some(u) = user {
+        let name = u.name().to_str();
+        if name.is_some() {
+            println!("{}", name.unwrap());
+        }
+    }
+}