---
name: "udcli"
section: "1"
platform: "linux"
package: "udcli"
version: "0+20221013-1.1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/udcli"
---

# udcli(1)

A CLI tool for quick disassembly of x86 and x86-64 class instruction set architectures.

## NAME

udcli - A CLI tool for quick disassembly of x86 and x86-64 class instruction set architectures.

## SYNOPSIS

**udcli** \[-option(s)\] file

## DESCRIPTION

**udcli** is a CLI front-end to the Udis86 Disassembler library.

## OPTIONS

- **-16**

  Set the disassembly mode to 16 bits.

- **-32**

  Set the disassembly mode to 32 bits. (default)

- **-64**

  Set the disassembly mode to 64 bits.

- **-intel**

  Set the output to INTEL (NASM like) syntax. (default)

- **-att**

  Set the output to AT&T (GAS like) syntax.

- **-v \<v\>**

  Set vendor. \<v\> = {intel, amd}.

- **-o \<pc\>**

  Set the value of the program counter to \<pc\>. (default = 0)

- **-s \<n\>**

  Set the number of bytes to skip before disassembly to \<n\>.

- **-c \<n\>**

  Set the number of bytes to disassemble to \<n\>.

- **-x**

  Set the input mode to whitespace separated 8-bit numbers in hexadecimal representation. Example: 0f 01 ae 00

- **-noff**

  Do not display the offset of instructions.

- **-nohex**

  Do not display the hexadecimal code of instructions.

- **-eflags**

  Display information on EFLAGS register.

- **-access**

  Display access information on operand.

- **-implicit**

  Display implicit registers used or modified by the instruction.

- **-h**

  Display this help message.

- **--version**

  Show version

## Example

Usage example:

-

  ```
  echo "65 67 89 87 76 65 54 56 78 89 09 00 90" | udcli -32 -x
  ```

will result in output such as this:

-

  ```
  0000000080000800 656789877665     mov [gs:bx+0x6576], eax
  0000000080000806 54               push esp
  0000000080000807 56               push esi
  0000000080000808 7889             js 0x80000793
  000000008000080a 0900             or [eax], eax
  000000008000080c 90               nop
  ```

## Author

This version of Udis86 is based on a fork of the original project of the same name by Willem (canihavesomecoffee) (https://github.com/canihavesomecoffee). Udis86 was originally written by Vivek Thampi (https://github.com/vmt/).