AgentSkillsCN

self-extracting-script

创建自解压 Bash 脚本，利用 Base64 编码嵌入任意有效负载（归档文件、可执行文件、配置文件）。适用于创建便携式单文件安装程序、部署包，或在无需外部依赖的情况下分发文件时使用。

SKILL.md
--- frontmatter
name: self-extracting-script
description: Create self-extracting Bash scripts that embed any payload (archives, executables, configs) using base64 encoding. Use when creating portable single-file installers, deployment packages, or distributing files without external dependencies.

Self-Extracting Script Skill

Generate self-extracting Bash scripts from any payload file. The generated scripts embed the payload as base64 and extract it when executed.

Quick Start

bash
# Basic extraction script
python scripts/create_self_extractor.py payload.tar.gz output.sh

# Auto-execute after extraction
python scripts/create_self_extractor.py setup.sh installer.sh --execute

# Custom output filename
python scripts/create_self_extractor.py config.json deploy.sh --output prod_config.json

Features

  • •Embeds any file type (binary or text) using base64 encoding
  • •Optional auto-execution of extracted content
  • •Custom output filenames
  • •Descriptive headers in generated scripts
  • •Portable - requires only bash and base64

Usage

bash
python scripts/create_self_extractor.py <payload> <output_script> [options]

Arguments

ArgumentDescription
payloadPath to the file to embed
output_scriptPath for the generated self-extracting script

Options

OptionDescription
--execute, -eRun extracted file after extraction (for scripts)
--output, -oCustom filename for extracted content
--description, -dDescription to include in script header

Examples

Software Deployment

bash
python scripts/create_self_extractor.py myapp.tar.gz deploy_myapp.sh \
    --description "MyApp v1.2.3 deployment package"

Auto-Running Installer

bash
python scripts/create_self_extractor.py install.sh installer.sh --execute

Configuration Distribution

bash
python scripts/create_self_extractor.py config.yaml setup.sh \
    --output /etc/myapp/config.yaml

How It Works

  1. •Reads the payload file (binary or text)
  2. •Base64-encodes the content
  3. •Generates a Bash script with embedded payload
  4. •Script uses heredoc to safely store encoded data
  5. •On execution: decodes payload → writes to file → optionally executes

Size Considerations

Base64 encoding increases size by ~33%:

  • •1 MB → ~1.33 MB
  • •10 MB → ~13.3 MB

For payloads >50MB, consider alternative distribution methods.

Dependencies

Generation: Python 3.6+ Execution: bash, base64 (standard on most Unix systems)