langchain_experimental.llm_bash.bash.BashProcess

class langchain_experimental.llm_bash.bash.BashProcess(strip_newlines: bool = False, return_err_output: bool = False, persistent: bool = False)

Wrapper for starting subprocesses.

Uses the python built-in subprocesses.run() Persistent processes are not available on Windows systems, as pexpect makes use of Unix pseudoterminals (ptys). MacOS and Linux are okay.

Example

from langchain_community.utilities.bash import BashProcess

bash = BashProcess(
    strip_newlines = False,
    return_err_output = False,
    persistent = False
)
bash.run('echo 'hello world'')

Initializes with default settings

Attributes

persistent	Whether or not to spawn a persistent session NOTE: Unavailable for Windows environments
return_err_output	Whether or not to return the output of a failed command, or just the error message and stacktrace
strip_newlines	Whether or not to run .strip() on the output

Methods

__init__([strip_newlines, ...])	Initializes with default settings
process_output(output, command)	Uses regex to remove the command from the output
run(commands)	Run commands in either an existing persistent subprocess or on in a new subprocess environment.

Parameters

• strip_newlines (bool) –

• return_err_output (bool) –

• persistent (bool) –

__init__(strip_newlines: bool = False, return_err_output: bool = False, persistent: bool = False)

Initializes with default settings

Parameters

• strip_newlines (bool) –

• return_err_output (bool) –

• persistent (bool) –

process_output(output: str, command: str) → str

Uses regex to remove the command from the output

Parameters

• output (str) – a process’ output string

• command (str) – the executed command

Return type

str

run(commands: Union[str, List[str]]) → str

Run commands in either an existing persistent subprocess or on in a new subprocess environment.

Parameters

commands (List[str]) – a list of commands to execute in the session

Return type

str