diff --git a/Cargo.toml b/Cargo.toml
index 28abd70..c8416bb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,4 +11,9 @@ publish = false
 [profile.dev]
 overflow-checks = false
 
+[profile.release]
+strip = true
+lto = true
+panic = "abort"
+
 [dependencies]
diff --git a/README.md b/README.md
index 9af8bc7..0b714b7 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,4 @@
 A zero-dependencies Labaski interpreter written in Rust. Fully supports [Labashki specs 1.4.1](./SPECIFICATION.md).
 
 ## Examples
-See `example-scripts` directory.
\ No newline at end of file
+See `scripts` directory.
\ No newline at end of file
diff --git a/build.bat b/build.bat
index 27b6875..9bf316b 100644
--- a/build.bat
+++ b/build.bat
@@ -1,5 +1,9 @@
 @echo off
+echo Building for Windows...
 cargo build --release
+echo Building for Linux...
 cargo zigbuild --release --target x86_64-unknown-linux-gnu
+echo Copy to bin...
 copy target\release\labast.exe bin\ /Y
-copy target\x86_64-unknown-linux-gnu\release\labast bin\ /Y
\ No newline at end of file
+copy target\x86_64-unknown-linux-gnu\release\labast bin\ /Y
+echo Done!
\ No newline at end of file
diff --git a/example-scripts/expr.lb b/scripts/expr.lb
similarity index 100%
rename from example-scripts/expr.lb
rename to scripts/expr.lb
diff --git a/example-scripts/hello-world.lb b/scripts/hello-world.lb
similarity index 100%
rename from example-scripts/hello-world.lb
rename to scripts/hello-world.lb
diff --git a/example-scripts/labels.lb b/scripts/labels.lb
similarity index 100%
rename from example-scripts/labels.lb
rename to scripts/labels.lb
diff --git a/example-scripts/math.lb b/scripts/math.lb
similarity index 100%
rename from example-scripts/math.lb
rename to scripts/math.lb
diff --git a/example-scripts/modules/main.lb b/scripts/modules/main.lb
similarity index 100%
rename from example-scripts/modules/main.lb
rename to scripts/modules/main.lb
diff --git a/example-scripts/modules/second_part.lb b/scripts/modules/second_part.lb
similarity index 100%
rename from example-scripts/modules/second_part.lb
rename to scripts/modules/second_part.lb
diff --git a/example-scripts/pick.lb b/scripts/pick.lb
similarity index 100%
rename from example-scripts/pick.lb
rename to scripts/pick.lb
diff --git a/example-scripts/size.lb b/scripts/size.lb
similarity index 100%
rename from example-scripts/size.lb
rename to scripts/size.lb
diff --git a/scripts/std/rev.lb b/scripts/std/rev.lb
new file mode 100644
index 0000000..21f9056
--- /dev/null
+++ b/scripts/std/rev.lb
@@ -0,0 +1,4 @@
+; Labashki standard library
+; Written by Labashki developer - aeris
+
+ARGS 0
\ No newline at end of file
diff --git a/scripts/std/rot.lb b/scripts/std/rot.lb
new file mode 100644
index 0000000..469cf7f
--- /dev/null
+++ b/scripts/std/rot.lb
@@ -0,0 +1,4 @@
+; Labashki standard library
+; Written by Labashki developer - aeris
+
+ARGS 3
\ No newline at end of file
diff --git a/scripts/std/unix/ВАРЁНЫЙНОСОК.lb b/scripts/std/unix/ВАРЁНЫЙНОСОК.lb
new file mode 100644
index 0000000..99a2bcf
--- /dev/null
+++ b/scripts/std/unix/ВАРЁНЫЙНОСОК.lb
@@ -0,0 +1,17 @@
+; Labashki standard library
+; Written by Labashki developer - aeris
+
+MAXSIZE
+ARGS 1 ; Насколько сварить носок
+SUB
+
+@ 1
+    JNZ 2
+    QUIT
+
+@ 2
+    #EXPR -
+    PUSH -1
+    _UNIX_RANDOM
+    SWAP
+    JMP 1
\ No newline at end of file
diff --git a/scripts/vareniynosok.lb b/scripts/vareniynosok.lb
new file mode 100644
index 0000000..3c600cc
--- /dev/null
+++ b/scripts/vareniynosok.lb
@@ -0,0 +1,2 @@
+SIZE
+#EXEC std\unix\ВАРЁНЫЙНОСОК.lb
\ No newline at end of file
diff --git a/src/execute.rs b/src/execute.rs
index 51fae58..19ac571 100644
--- a/src/execute.rs
+++ b/src/execute.rs
@@ -49,6 +49,7 @@ pub fn execute(stack: &mut Stack, mut origin_stack: Option<&mut Stack>, mod_name
             "MEOW" => instructions::meow::meow(&mut stack.memory),
             "DUMP" => instructions::dump::dump(&mut stack.memory),
             "SIZE" => instructions::size::size(&mut stack.memory),
+            "MAXSIZE" => instructions::maxsize::maxsize(&mut stack.memory),
 
             "#EXPR" => instructions::expr::expr(&mut stack.memory, &instruction.arg),
 
@@ -72,6 +73,9 @@ pub fn execute(stack: &mut Stack, mut origin_stack: Option<&mut Stack>, mod_name
             "ARGS"  => instructions::args::args(&mut stack.memory, &mut origin_stack, &instruction.data),
             "#EXEC" => instructions::exec::exec(stack, &instruction.arg.clone(), &mod_name),
 
+            #[cfg(target_family = "unix")] 
+            "_UNIX_RANDOM" => instructions::_unix_random::_unix_random(&mut stack.memory),
+
             // ?
             "NOP"  => continue,
             "EXIT" => instructions::exit::exit(&instruction.data),
diff --git a/src/instructions/_unix_random.rs b/src/instructions/_unix_random.rs
new file mode 100644
index 0000000..79258c1
--- /dev/null
+++ b/src/instructions/_unix_random.rs
@@ -0,0 +1,14 @@
+use std::fs::File;
+use std::io::Read;
+use crate::RunError;
+
+#[cfg(target_family = "unix")]
+pub fn _unix_random(memory: &mut Vec<u16>) {
+    let mut rng = File::open("/dev/urandom").unwrap();
+
+    let mut buffer = [0u8; 1];
+    rng.read_exact(&mut buffer).unwrap();
+
+    let data = &memory.pop().expect(&format!("{}", RunError::MemoryEmpty));
+    memory.push((buffer[0] as u16) % (*data - 1));
+}
\ No newline at end of file
diff --git a/src/instructions/args.rs b/src/instructions/args.rs
index 8bbeebe..a80bec1 100644
--- a/src/instructions/args.rs
+++ b/src/instructions/args.rs
@@ -1,7 +1,7 @@
 use crate::{errors::RunError, stack::Stack};
 
 pub fn args(memory: &mut Vec<u16>, origin_stack: &mut Option<&mut Stack>, data: &u16) {
-    let origin_memory = &mut origin_stack.as_mut().expect("msg").memory;
+    let origin_memory = &mut origin_stack.as_mut().expect(&format!("{}", RunError::RequestArgsInMainModule)).memory;
 
     if *origin_memory == *memory {
         eprintln!("{}", RunError::RequestArgsInMainModule);
diff --git a/src/instructions/dump.rs b/src/instructions/dump.rs
index a2df7f4..bfd1825 100644
--- a/src/instructions/dump.rs
+++ b/src/instructions/dump.rs
@@ -1,4 +1,9 @@
 pub fn dump(memory: &mut Vec<u16>) {
+    if memory.is_empty() {
+        println!("Stack is empty.");
+        return;
+    }
+
     for (i, entry) in memory.iter().enumerate() {
         println!("{0}: {1}", i, entry);
     }
diff --git a/src/instructions/jnz.rs b/src/instructions/jnz.rs
index 2093234..4216cd4 100644
--- a/src/instructions/jnz.rs
+++ b/src/instructions/jnz.rs
@@ -6,7 +6,7 @@ pub fn jnz(memory: &mut Vec<u16>, labels: &mut [Option<i16>; 256], program_count
         std::process::exit(2);
     }
 
-    if memory.pop() != Some(0) {
+    if memory.last() != Some(&0) {
         *program_counter = (labels[*data as usize].unwrap() - 1) as u16;
     }
 }
\ No newline at end of file
diff --git a/src/instructions/jz.rs b/src/instructions/jz.rs
index f85838d..cc2fcba 100644
--- a/src/instructions/jz.rs
+++ b/src/instructions/jz.rs
@@ -6,7 +6,7 @@ pub fn jz(memory: &mut Vec<u16>, labels: &mut [Option<i16>; 256], program_counte
         std::process::exit(2);
     }
 
-    if memory.pop() == Some(0) {
+    if memory.last() == Some(&0) {
         *program_counter = (labels[*data as usize].unwrap() - 1) as u16;
     }
 }
\ No newline at end of file
diff --git a/src/instructions/maxsize.rs b/src/instructions/maxsize.rs
new file mode 100644
index 0000000..5d7769d
--- /dev/null
+++ b/src/instructions/maxsize.rs
@@ -0,0 +1,3 @@
+pub fn maxsize(memory: &mut Vec<u16>) {
+    memory.push(65535);
+}
\ No newline at end of file
diff --git a/src/instructions/mod.rs b/src/instructions/mod.rs
index 1fa4217..6cf89ee 100644
--- a/src/instructions/mod.rs
+++ b/src/instructions/mod.rs
@@ -19,4 +19,7 @@ pub mod exec;
 pub mod args;
 pub mod expr;
 pub mod size;
-pub mod exit;
\ No newline at end of file
+pub mod exit;
+pub mod maxsize;
+#[cfg(target_family = "unix")]
+pub mod _unix_random;
diff --git a/src/parse.rs b/src/parse.rs
index b05e6d1..96dc0e0 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -24,7 +24,13 @@ pub fn parse(stack: &mut Stack, file_content: &str) {
         if command.len() >= 2 {
             match name.chars().nth(0) {
                 Some('#') => arg = command[1].to_string(),
-                _ => data = command[1].parse().expect(&format!("{}", ParseError::DataNotAUInt(command[0].to_string(), i + 1))),
+                _ => {
+                    if command[1] == "-1" { // required for _UNIX_RANDOM instruction
+                        data = 65535;
+                    } else {
+                        data = command[1].parse().expect(&format!("{}", ParseError::DataNotAUInt(command[0].to_string(), i + 1)))
+                    }
+                }
             }
         }