fmfug 1.2.1

Fast Memory Friendly Username Generator

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🦂 FMFUG — Fast Memory Friendly Username Generator

FMFUG is a high-performance, multithreaded username generator written in Python. It is designed to handle millions of name combinations without consuming excessive RAM, making it ideal for generating large wordlists for pentesting, security assessments, or system administration.

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🚀 Features

• Memory Friendly: Uses lazy evaluation and streaming. Can process millions of names with minimal RAM usage.
• Fast I/O: Implements output buffering to minimize disk write operations.
• Multithreaded: processes names in parallel for maximum speed.
• Customizable: Supports custom format patterns (e.g., first.last, first[1]last).
• Combinatorial Mode: Can generate combinations from separate first and last name files (Cartesian product) without loading everything into memory.

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❓ Why ❓

• username-anarchy made my pc burn down to ashes

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📦 Installation

1. Install from pypi

Using pipx

pipx install fmfug

2. Install from source

1. Clone the repository:

   git clone https://github.com/0xudodelige/fmfug.git
   cd fmfug
   

2. Install: Using pipx

   pipx install .
   

   (Note: The script works without tqdm, but installing it provides a progress bar).

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🧑💻 Usage

usage: fmfug [-h] [-i INPUT] [-o OUTPUT] [-f FORMAT_LIST]
                [--formats FORMATS] [-t THREADS] [--no-parallel]
                [--case-sensitive] [-q] [--list-formats]
                [--first-names FIRST_NAMES] [--last-names LAST_NAMES]

Generate username variations (streaming + multithreading)

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🛠 Command-Line Options

Option	Description
-i, --input INPUT	Input file with full names (default: users.txt, use - for stdin)
-fn, --first-names FIRST_NAMES	File containing first names (one per line)
-ln, --last-names LAST_NAMES	File containing last names (one per line)
-o, --output OUTPUT	Output file (default: stdout)
-f, --format FORMAT_LIST	Add custom format pattern (repeatable)
--formats FORMATS	File containing format patterns
-t, --threads THREADS	Number of threads (default: 4)
--case-sensitive	Preserve original case
-q, --quiet	Quiet mode (for redirection or pipe)
--list-formats	Show default format patterns
-h, --help	Show help message

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🧩 Supported Format Patterns

Name Components

first     → full first name
last      → full last name
middle    → middle name (if present)

Combinations

firstlast
first.last
first_last
first-last
13__37@firstFOOlastBAR (Why not)

Truncation

first[1] → first character of first name (Initial)
last[4]  → first 4 characters of last name

Capitalization

First       → Capitalized
Last        → Capitalized
FirstLast   → PascalCase

Numeric Suffixes

first5  → appends 0..5
last12   → appends 0..12

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📘 Examples

1. Basic usage

fmfug

2. Output to file

fmfug -o usernames.txt

3. Use 8 threads

fmfug -t 8

4. Inline custom formats

fmfug -f "first.last" -f "first[1].last" -o out.txt

5. Load custom formats from file

fmfug --formats patterns.txt

6. Case-sensitive output

fmfug --case-sensitive

7. First/Last name combination mode

fmfug --first-names fn.txt --last-names ln.txt

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📜 License

MIT License. See LICENSE file for details.