ConfigGenerator

POSIX Shell Script Generator

Generate highly portable POSIX shell scripts (/bin/sh) that work seamlessly on Alpine, BusyBox, macOS, and minimal containers.

Output:A ready-to-use configuration file for POSIX Shell Script with best practices applied.

Note: This POSIX compatibility check uses static analysis to catch common portability issues. It is not a full shell parser. For critical production scripts, also test with dash, ash, BusyBox sh, and ShellCheck.

Typically /bin/sh for maximum portability.

- Fails on any error and unset variables. (POSIX does not support pipefail).
- Adds a portable trap to catch unexpected exits.
- Avoids polluting global scope.

Your core POSIX shell commands.

script.sh
 Usage Instructions
# 1. Save the file
nano script.sh

# 2. Make the script executable
chmod +x script.sh

# 3. Run the script explicitly with sh
sh script.sh

# 4. (Optional) Run ShellCheck to verify POSIX compliance
shellcheck -s sh script.sh
 What is this tool?
While Bash is popular, many minimal environments (like Alpine Linux containers, BusyBox, and embedded systems) do not have Bash installed. POSIX-compliant /bin/sh scripts guarantee maximum portability across virtually any Unix-like system.
 POSIX Rules of Thumb
  • Use `[ ]` instead of `[[ ]]`: The double-bracket test is a Bash extension.
  • Use `=` instead of `==`: In POSIX `[ ]` tests, string equality is checked with a single equals sign.
  • Avoid Arrays: POSIX shell does not support arrays. You must use positional parameters (`$1, $2`) or delimited strings.
  • Use `.` instead of `source`: `source` is a bashism. Use `. /path/to/file` to load variables.
  • Avoid the `function` keyword: Declare functions using `name() {` instead of `function name {`.
 Frequently Asked Questions
What is a 'Bashism'?
A Bashism is a syntax feature exclusive to Bash (like [[ ]] or arrays) that will cause a syntax error in stricter, minimal shells like dash or BusyBox ash.
Why use /bin/sh instead of Bash?
Using /bin/sh is mandatory for Alpine Docker images and heavily reduces the footprint of the runtime environment. It forces you to write cleaner, more standard shell code.
Does set -eu work in POSIX?
Yes, set -e (exit on error) and set -u (exit on unset variable) are fully POSIX compliant. However, set -o pipefail is NOT POSIX and will fail in many shells.
How We Keep Your Configs Safe & Valid
 Built-in Error Checking
Every file is checked against official rules. We catch missing fields and bad syntax. YAML indentation errors are flagged right away. Kubernetes, Terraform, and Docker specs are all covered. API versions and labels are verified too. You get valid output every time you generate.
100% Private & Local
All tools run in your browser only. Your API keys never leave your machine. We do not use any tracking scripts. No data is sent to any server. Passwords and secrets stay on your device. Crypto operations use the Web Crypto API. Your privacy is fully protected at all times.
 Secure Settings by Default
Configs use safe defaults out of the box. Containers run as non-root users. Root filesystems are set to read-only. Dangerous Linux capabilities are dropped. Network policies limit pod-to-pod traffic. TLS 1.3 is enabled for web servers. Security headers are added where needed.
Ready for CI/CD & Git
Output files are ready for your Git repo. Use them with ArgoCD, Flux, or GitHub Actions. Files use clear formatting and comments. Code review is easy for your team. Indentation and key order are consistent. Test in staging before going to production. Every file is clean and well-structured.
 Infrastructure as Code
Store configs in Git alongside your code. Terraform modules include typed variables. Backend configs support remote state locking. Outputs work across multiple modules. Ansible playbooks use clear task steps. Chef and Puppet configs are also supported. Every file works with version control tools.
Monitoring & Tracing
Set up Prometheus with auto-discovery rules. Create Grafana dashboards with template variables. Add alerting rules with severity labels. Use OpenTelemetry for trace collection. Forward logs to Loki or Elasticsearch. Connect to Jaeger or Tempo for tracing. Monitor metrics, logs, and traces together.
Container & Docker Safety
Dockerfiles use multi-stage builds for small images. Base images are pinned to exact versions. Dev files are excluded from final images. Health checks are added for orchestrator use. Containers switch to non-root users. Docker Compose uses named volumes and networks. Resource limits are set in deploy configs.
 Multiple Output Formats
Export as YAML, JSON, HCL, or TOML. Kubernetes uses YAML with proper separators. Terraform uses HCL with correct escaping. JSON output has consistent indentation. Copy to clipboard with one click. Preview output with syntax highlighting. Line numbers help you review quickly.