diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..36f971e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+bin/*
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..7556750
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,16 @@
+set -ex
+
+echo "compiling true"
+nasm -f elf64 -o tmp/true.o src/true/true.asm
+ld -s --nmagic -o bin/true tmp/true.o
+ls -l bin/true
+
+echo "compiling false"
+nasm -f elf64 -o tmp/false.o src/false/false.asm
+ld -s --nmagic -o bin/false tmp/false.o
+ls -l bin/false
+
+echo "compiling cat"
+nasm -f elf64 -o tmp/cat.o src/cat/cat.asm
+ld -s -o bin/cat tmp/cat.o
+ls -l bin/cat
diff --git a/src/cat/cat.asm b/src/cat/cat.asm
new file mode 100644
index 0000000..71b9d30
--- /dev/null
+++ b/src/cat/cat.asm
@@ -0,0 +1,90 @@
+%define STDOUT 1
+%define STDERR 2
+
+%define SYS_READ 0
+%define SYS_WRITE 1
+%define SYS_OPEN 2
+%define SYS_CLOSE 3
+%define SYS_EXIT 60
+
+%define O_RDONLY 0
+
+section .bss
+    buf resb 4096
+
+section .data
+    file_err_m db "file error", 10, 0
+    args_err_m db "args error", 10, 0
+
+section .text
+global _start
+
+_start:
+    ; так ну для начала надо бы понять сколько у нас аргументов
+    mov rbx, [rsp]
+    cmp rbx, 1
+    je .prep_narg
+    cmp rbx, 2
+    jne args_err
+    jmp .prep
+.prep_narg:
+    xor r12, r12
+    jmp .loop
+.prep:
+    mov rax, SYS_OPEN
+    mov rdi, [rsp + 16]; argv[1]
+    mov rsi, O_RDONLY
+    xor rdx, rdx
+    syscall
+    js file_err
+
+    mov r12, rax
+.loop:
+    mov rax, SYS_READ
+    mov rdi, r12
+    mov rsi, buf
+    mov rdx, 4096
+    syscall
+
+    test rax, rax
+    jz .done
+
+    mov rdx, rax
+    mov rax, SYS_WRITE
+    mov rdi, STDOUT
+    mov rsi, buf
+    syscall
+    jmp .loop
+.done:
+    mov rax, SYS_CLOSE
+    mov rdi, r12
+    syscall
+    jmp exit
+
+file_err:
+    mov rax, SYS_WRITE
+    mov rdi, STDERR
+    mov rsi, file_err_m
+    mov rdx, 12
+    syscall
+
+    jmp exit_err
+
+args_err:
+    mov rax, SYS_WRITE
+    mov rdi, STDERR
+    mov rsi, args_err_m
+    mov edx, 12
+    syscall
+
+    jmp exit_err
+
+exit_err:
+    mov rax, SYS_EXIT
+    mov rdi, 1
+    syscall
+
+exit:
+    mov rax, SYS_EXIT
+    mov rdi, 0
+    syscall
diff --git a/src/false/false.asm b/src/false/false.asm
new file mode 100644
index 0000000..9a63501
--- /dev/null
+++ b/src/false/false.asm
@@ -0,0 +1,7 @@
+section .text
+global _start
+
+_start:
+    mov rax, 60
+    mov rdi, 1
+    syscall
diff --git a/src/true/true.asm b/src/true/true.asm
new file mode 100644
index 0000000..a6bfb62
--- /dev/null
+++ b/src/true/true.asm
@@ -0,0 +1,7 @@
+section .text
+global _start
+
+_start:
+    mov rax, 60
+    xor rdi, rsi
+    syscall
diff --git a/tmp/cat.o b/tmp/cat.o
new file mode 100644
index 0000000..b68b9a7
Binary files /dev/null and b/tmp/cat.o differ
diff --git a/tmp/false.o b/tmp/false.o
new file mode 100644
index 0000000..d4ae94f
Binary files /dev/null and b/tmp/false.o differ
diff --git a/tmp/true.o b/tmp/true.o
new file mode 100644
index 0000000..945e55d
Binary files /dev/null and b/tmp/true.o differ