Shell（bash）

让代理访问 shell 非常强大（尽管在没有沙箱环境的情况下很危险）。

LLM 可以使用它来执行任何 shell 命令。此功能的常见用例是让 LLM 与您的本地文件系统交互。

注意：Shell 工具不适用于 Windows 操作系统。

%pip install --upgrade --quiet langchain-community

from langchain_community.tools import ShellTool

shell_tool = ShellTool()

API 参考：ShellTool

print(shell_tool.run({"commands": ["echo 'Hello World!'", "time"]}))

Hello World!

real    0m0.000s
user    0m0.000s
sys 0m0.000s
``````output
/Users/wfh/code/lc/lckg/langchain/tools/shell/tool.py:34: UserWarning: The shell tool has no safeguards by default. Use at your own risk.
  warnings.warn(

与代理一起使用

与所有工具一样，这些工具可以提供给代理，以完成更复杂的任务。让我们让代理从网页中获取一些链接。

from langchain.agents import AgentType, initialize_agent
from langchain_openai import ChatOpenAI

llm = ChatOpenAI(temperature=0)

shell_tool.description = shell_tool.description + f"args {shell_tool.args}".replace(
    "{", "{{"
).replace("}", "}}")
self_ask_with_search = initialize_agent(
    [shell_tool], llm, agent=AgentType.CHAT_ZERO_SHOT_REACT_DESCRIPTION, verbose=True
)
self_ask_with_search.run(
    "Download the langchain.com webpage and grep for all urls. Return only a sorted list of them. Be sure to use double quotes."
)

API 参考：AgentType | initialize_agent | ChatOpenAI

> Entering new AgentExecutor chain...
Question: What is the task?
Thought: We need to download the langchain.com webpage and extract all the URLs from it. Then we need to sort the URLs and return them.
Action:

{ "action": "shell", "action_input": { "commands": [ "curl -s https://www.langchain.ac.cn | grep -o 'http[s]://[^\" ]' | sort" ] } }


``````output
/Users/wfh/code/lc/lckg/langchain/tools/shell/tool.py:34: UserWarning: The shell tool has no safeguards by default. Use at your own risk.
  warnings.warn(
``````output

Observation: https://blog.langchain.ac.cn/
https://discord.gg/6adMQxSpJS
https://docs.langchain.com/docs/
https://github.com/hwchase17/chat-langchain
https://github.com/hwchase17/langchain
https://github.com/hwchase17/langchainjs
https://github.com/sullivan-sean/chat-langchainjs
https://js.langchain.ac.cn/docs/
https://python.langchain.ac.cn/en/latest/
https://twitter.com/langchainai

Thought:The URLs have been successfully extracted and sorted. We can return the list of URLs as the final answer.
Final Answer: ["https://blog.langchain.ac.cn/", "https://discord.gg/6adMQxSpJS", "https://docs.langchain.com/docs/", "https://github.com/hwchase17/chat-langchain", "https://github.com/hwchase17/langchain", "https://github.com/hwchase17/langchainjs", "https://github.com/sullivan-sean/chat-langchainjs", "https://js.langchain.ac.cn/docs/", "https://python.langchain.ac.cn/en/latest/", "https://twitter.com/langchainai"]

> Finished chain.

'["https://blog.langchain.ac.cn/", "https://discord.gg/6adMQxSpJS", "https://docs.langchain.com/docs/", "https://github.com/hwchase17/chat-langchain", "https://github.com/hwchase17/langchain", "https://github.com/hwchase17/langchainjs", "https://github.com/sullivan-sean/chat-langchainjs", "https://js.langchain.ac.cn/docs/", "https://python.langchain.ac.cn/en/latest/", "https://twitter.com/langchainai"]'

相关

• 工具 概念指南
• 工具 操作指南