> ## Documentation Index
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# utility
# `prefect.deployments.steps.utility`
Utility project steps that are useful for managing a project's deployment lifecycle.
Steps within this module can be used within a `build`, `push`, or `pull` deployment action.
Example:
Use the `run_shell_script` setp to retrieve the short Git commit hash of the current
repository and use it as a Docker image tag:
```yaml theme={null}
build:
- prefect.deployments.steps.run_shell_script:
id: get-commit-hash
script: git rev-parse --short HEAD
stream_output: false
- prefect_docker.deployments.steps.build_docker_image:
requires: prefect-docker
image_name: my-image
image_tag: "{{ get-commit-hash.stdout }}"
dockerfile: auto
```
## Functions
### `run_shell_script`
```python theme={null}
run_shell_script(script: str, directory: Optional[str] = None, env: Optional[Dict[str, str]] = None, stream_output: bool = True, expand_env_vars: bool = False, shell: bool = False) -> RunShellScriptResult
```
Runs one or more shell commands in a subprocess. Returns the standard
output and standard error of the script.
**Args:**
* `script`: The script to run
* `directory`: The directory to run the script in. Defaults to the current
working directory.
* `env`: A dictionary of environment variables to set for the script
* `stream_output`: Whether to stream the output of the script to
stdout/stderr
* `expand_env_vars`: Whether to expand environment variables in the script
before running it
* `shell`: Whether to run the command through the system shell.
When True, shell operators like pipes (|), redirects (>),
and logical operators (&&, ||) are supported. Only set this
to True when you need shell features, as it has security
implications similar to subprocess.run(shell=True).
**Returns:**
* A dictionary with the keys `stdout` and `stderr` containing the output
of the script
**Examples:**
Retrieve the short Git commit hash of the current repository to use as
a Docker image tag:
```yaml theme={null}
build:
- prefect.deployments.steps.run_shell_script:
id: get-commit-hash
script: git rev-parse --short HEAD
stream_output: false
- prefect_docker.deployments.steps.build_docker_image:
requires: prefect-docker
image_name: my-image
image_tag: "{{ get-commit-hash.stdout }}"
dockerfile: auto
```
Run a multi-line shell script:
```yaml theme={null}
build:
- prefect.deployments.steps.run_shell_script:
script: |
echo "Hello"
echo "World"
```
Run a shell script with environment variables:
```yaml theme={null}
build:
- prefect.deployments.steps.run_shell_script:
script: echo "Hello $NAME"
env:
NAME: World
```
Run a shell script with environment variables expanded
from the current environment:
```yaml theme={null}
pull:
- prefect.deployments.steps.run_shell_script:
script: |
echo "User: $USER"
echo "Home Directory: $HOME"
stream_output: true
expand_env_vars: true
```
Run a shell script in a specific directory:
```yaml theme={null}
build:
- prefect.deployments.steps.run_shell_script:
script: echo "Hello"
directory: /path/to/directory
```
Run a script stored in a file:
```yaml theme={null}
build:
- prefect.deployments.steps.run_shell_script:
script: "bash path/to/script.sh"
```
Run a command that uses shell operators like pipes:
```yaml theme={null}
push:
- prefect.deployments.steps.run_shell_script:
script: echo "hello world" | tr '[:lower:]' '[:upper:]'
shell: true
```
### `pip_install_requirements`
```python theme={null}
pip_install_requirements(directory: Optional[str] = None, requirements_file: str = 'requirements.txt', stream_output: bool = True) -> dict[str, Any]
```
Installs dependencies from a requirements.txt file.
**Args:**
* `requirements_file`: The requirements.txt to use for installation.
* `directory`: The directory the requirements.txt file is in. Defaults to
the current working directory.
* `stream_output`: Whether to stream the output from pip install should be
streamed to the console
**Returns:**
* A dictionary with the keys `stdout` and `stderr` containing the output
the `pip install` command
**Raises:**
* `subprocess.CalledProcessError`: if the pip install command fails for any reason
## Classes
### `RunShellScriptResult`
The result of a `run_shell_script` step.
**Attributes:**
* `stdout`: The captured standard output of the script.
* `stderr`: The captured standard error of the script.
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