envsubst
Substitute environment variables in a string
Decision gist · record as of 2026-08-14
Yes, if you need simple shell-style variable substitution and can accept that the package is unmaintained. The low install friction and permissive MIT license make it a lightweight choice for straightforward use cases. No, if you require active maintenance, Python version compatibility guarantees, or support for complex templating—consider a maintained alternative or implement substitution inline.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Install friction is low with no runtime dependencies.
- However, the package is abandoned—last release was 2019-10-05 and the repository shows no commits since 2023-07-07.
- No active maintenance means security or compatibility issues will not be addressed.
License · maintenance · safety
MIT (permissive) — Licensed under MIT (permissive), so you can use, modify, and distribute the package freely with minimal restrictions.
last release 2019-10-05 (2505 days) · last repo commit 2023-07-07 · 8 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 144,892 downloads/mo, #11,140 on PyPI
Alternatives
Verify before relying
import os
from envsubst import envsubst
os.environ['USER'] = 'alice'
os.environ['HOST'] = 'example.com'
result = envsubst('$USER@$HOST')
print(result) # alice@example.com- Whether the package works correctly with modern Python versions (requires_python is unspecified)
- Whether argv-based substitution ($0, $1, etc.) is fully documented or tested
- Whether nested or complex variable references beyond the documented examples are supported
What it is and what it does
envsubst is a lightweight utility for performing shell-style environment variable substitution within Python strings. It parses strings containing variable references like `$VAR` or `${VAR}` and replaces them with their corresponding environment variable values. The package supports default value syntax—`${VAR:-default}` uses a default if the variable is unset, and `${VAR-default}` uses a default only if the variable is unset or empty—mirroring common shell behavior.
The package has no runtime dependencies and installs as a pure Python wheel, making it simple to add to any project. However, it has been abandoned since its last release in October 2019, with no commits to the repository since July 2023. This means any bugs or compatibility issues with newer Python versions will not be fixed by the maintainer.
Use it for
- Substitute environment variables into configuration strings or templates at runtime without external templating libraries.
- Parse and expand shell-like variable references in user-provided strings or configuration files.
- Build dynamic command strings or paths that depend on environment variables with fallback defaults.
- Migrate shell scripts to Python while preserving variable substitution syntax familiar to shell users.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need simple shell-style variable substitution and can accept that the package is unmaintained.
The low install friction and permissive MIT license make it a lightweight choice for straightforward use cases. No, if you require active maintenance, Python version compatibility guarantees, or support for complex templating—consider a maintained alternative or implement substitution inline.
Install
envsubst on PyPI
Before you install
Install friction is low with no runtime dependencies. However, the package is abandoned—last release was 2019-10-05 and the repository shows no commits since 2023-07-07. No active maintenance means security or compatibility issues will not be addressed.
License in practice
Licensed under MIT (permissive), so you can use, modify, and distribute the package freely with minimal restrictions.
Quickstart
import os
from envsubst import envsubst
os.environ['USER'] = 'alice'
os.environ['HOST'] = 'example.com'
result = envsubst('$USER@$HOST')
print(result) # alice@example.comVerify before relying
- Whether the package works correctly with modern Python versions (requires_python is unspecified)
- Whether argv-based substitution ($0, $1, etc.) is fully documented or tested
- Whether nested or complex variable references beyond the documented examples are supported
Package facts
| License | MIT permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Abandoned 2,505 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 144,892 / month, #11,140 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
Evidence: envsubst-0.1.5-py2.py3-none-any.whl
Tags
Let your AI agent find packages like this
Example. Real query, live index.
You found this page by searching. An agent finds it by wishing: SkillFed indexes 14,416 PyPI packages by what they can do, searchable in plain language.
wish › “environment variable substitution”
- envsubstSubstitutes environment variables in strings using shell-like syntax,…
- pyhoconParses HOCON (Human-Optimized Config Object Notation) configuration…
- expandvarsExpands Unix-style variable references in strings with bash-like…
Give your agent the search over MCP, or paste the wish link into any chat.
More Utilities packages
Converts domain names between Unicode and ASCII-compatible encoding (Punycode) according to IDNA 2008 and Unicode Technical Standard 46, with security validation and broader script coverage than the standard library.
Install it if you work with internationalized domain names, need to validate domains, or use HTTP clients that depend on it transitively.
Detects and normalizes text encoding from unknown or ambiguous sources, supporting all IANA character sets that Python's core library provides codecs for, with the ability to register custom codecs.
Setuptools is a Python build backend and package management tool that handles building, distributing, and installing Python packages, including support for C/C++ extension modules.
Pluggy provides a plugin system that lets you define hook specifications and register implementations to be called in sequence, enabling extensible Python applications without tight coupling.
Install it if you're building an extensible application or framework.
Pygments is a syntax highlighter that colorizes source code and text in over 500 languages and formats, outputting to HTML, LaTeX, RTF, SVG, images, or ANSI terminal sequences.
Install it if you need to display or transform source code.
Six provides utility functions to write Python code that runs on both Python 2.7 and Python 3.3+, smoothing over language differences between the two versions.
See also expandvars · parameter-expansion-patched · tempenv · environs · py-expression-eval · pytest-env · dynamic-yaml · pyaml-env · envyaml · uritemplate