diff --git a/Cargo.lock b/Cargo.lock
index 82b190c..ae279da 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,6 +11,29 @@ name = "coreutils"
 version = "0.1.0"
 dependencies = [
  "boxutils",
+ "num_cpus",
+]
+
+[[package]]
+name = "hermit-abi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
+
+[[package]]
+name = "libc"
+version = "0.2.171"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
+
+[[package]]
+name = "num_cpus"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
+dependencies = [
+ "hermit-abi",
+ "libc",
 ]
 
 [[package]]
diff --git a/coreutils/Cargo.lock b/coreutils/Cargo.lock
index a5075b7..5befca4 100644
--- a/coreutils/Cargo.lock
+++ b/coreutils/Cargo.lock
@@ -11,4 +11,27 @@ name = "coreutils"
 version = "0.1.0"
 dependencies = [
  "boxutils",
+ "num_cpus",
+]
+
+[[package]]
+name = "hermit-abi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
+
+[[package]]
+name = "libc"
+version = "0.2.171"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
+
+[[package]]
+name = "num_cpus"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
+dependencies = [
+ "hermit-abi",
+ "libc",
 ]
diff --git a/coreutils/Cargo.toml b/coreutils/Cargo.toml
index 5c88adc..90f2bdc 100644
--- a/coreutils/Cargo.toml
+++ b/coreutils/Cargo.toml
@@ -5,3 +5,4 @@ edition = "2024"
 
 [dependencies]
 boxutils = { path = "../utils" }
+num_cpus = "1.16.0"
diff --git a/coreutils/src/commands/dd.rs b/coreutils/src/commands/dd.rs
index 43fac19..c3da024 100644
--- a/coreutils/src/commands/dd.rs
+++ b/coreutils/src/commands/dd.rs
@@ -25,7 +25,7 @@ impl Command for Dd {
             if v.parse::<u64>().is_ok() {
                 // assume the bs is specified in bytes,
                 // because the last char is a number
-                blocksize = bs.parse::<u64>().unwrap()
+            blocksize = bs.parse::<u64>().unwrap()
             } else {
                 match v {
                     "K" | "k" => blocksize = k.parse::<u64>().unwrap() * 1024,
@@ -59,8 +59,8 @@ impl Command for Dd {
             let _ = io::stdout().write_all(&vecbuf);
         }
 
-        let duration = start.elapsed().as_millis() / 1000;
-
+        let duration = start.elapsed().as_secs_f64();
+        let kb_per_sec = (vecbuf.len() as f64 / 1024.0) / duration;
         let out_blocks = vecbuf.len() as u64 / blocksize;
         let out_remainder = vecbuf.len() as u64 % blocksize;
 
@@ -77,9 +77,12 @@ impl Command for Dd {
         );
 
         println!(
-            "{} bytes copied, ca. {} seconds",
+            "{} bytes ({}B) copied, {:.6} seconds, {:.2}KB/s",
             vecbuf.len(),
-            duration
+            vecbuf.len(),
+            duration,
+            kb_per_sec
+
         )
     }
 }
diff --git a/coreutils/src/commands/mod.rs b/coreutils/src/commands/mod.rs
index 2a57ec5..d1967a4 100644
--- a/coreutils/src/commands/mod.rs
+++ b/coreutils/src/commands/mod.rs
@@ -12,3 +12,6 @@ pub use mkdir::Mkdir;
 
 mod dd;
 pub use dd::Dd;
+
+mod nproc;
+pub use nproc::Nproc;
diff --git a/coreutils/src/commands/nproc.rs b/coreutils/src/commands/nproc.rs
new file mode 100644
index 0000000..eaf58f0
--- /dev/null
+++ b/coreutils/src/commands/nproc.rs
@@ -0,0 +1,53 @@
+use boxutils::commands::Command;
+use boxutils::args::ArgParser;
+use std::env;
+use num_cpus::{get, get_physical};
+
+pub struct Nproc;
+
+impl Command for Nproc {
+    fn execute(&self) {
+        let raw_args = env::args().collect::<Vec<_>>();
+        let args = ArgParser::builder()
+            .add_flag("--help")
+            .add_flag("--ignore")
+            .add_flag("--all")
+            .parse("nproc", raw_args);
+        let mut ignore: u64 = 0;
+        let mut all = false;
+        if args.get_flag("--help") {
+            println!(
+"
+Usage: nproc [--all] [ignore=N]
+Prints the number of available CPUs to stdout.
+
+    --all       List all installed CPUs
+    --ignore=N, --ignore N  Ignore N CPUs
+"
+            );
+            return
+        }
+
+        if args.get_flag("--all") {
+            all = true;
+        }
+
+        if args.get_flag("--ignore") {
+            ignore = args.get_option("--ignore").unwrap().parse().unwrap();
+        }
+
+        for argument in args.get_normal_args() {
+            if let Some((k, v)) = argument.split_once('=') {
+                if k == "--ignore" {
+                    ignore = v.parse().unwrap();
+                }
+            }
+        }
+
+        if all {
+            println!("{}", get() as u64 - ignore) // TODO: actually make `--all` do something
+        } else {
+            println!("{}", get() as u64 - ignore)
+        }
+    }
+}
diff --git a/src/registry.rs b/src/registry.rs
index 6967e7d..8a18606 100644
--- a/src/registry.rs
+++ b/src/registry.rs
@@ -10,6 +10,7 @@ pub fn get_registry() -> CommandRegistry {
     registry.register("mkdir", Box::new(coreutils::commands::Mkdir));
     registry.register("ash", Box::new(shell::ash::Ash));
     registry.register("dd", Box::new(coreutils::commands::Dd));
+    registry.register("nproc", Box::new(coreutils::commands::Nproc));
     registry.register("box", Box::new(Boxcmd));
 
     registry