Shell Dep Standards 〈OFFICIAL • 2025〉

Introduction

Shell deployment standards are a set of best practices and guidelines for deploying and managing shell scripts, commands, and other executable code in a Linux or Unix-like environment. The goal of these standards is to ensure that shell code is written, deployed, and maintained in a consistent, reliable, and secure manner.

Shell Scripting Standards

  1. Shebang Line: All shell scripts must start with a shebang line (#!/bin/bash or #!/usr/bin/env bash) to specify the interpreter.
  2. Script Header: Include a script header with metadata, such as:
    • Script name and description
    • Author and contact information
    • Date and version
  3. Code Organization: Organize code into logical sections, such as:
    • Variables and constants
    • Functions
    • Main script body
  4. Variable Naming: Use descriptive and consistent variable names, following the $lowercase_with_underscores convention.
  5. Commenting: Use comments to explain complex code, functions, and logic.
  6. Error Handling: Implement robust error handling using set -e, set -x, and trap commands.
  7. Quote Strings: Always quote strings to prevent word splitting and globbing.

Deployment Standards

  1. File Permissions: Set execute permissions on scripts using chmod +x script.sh.
  2. Script Location: Store scripts in a designated directory, such as /usr/local/bin or /opt/scripts.
  3. Script Naming: Use a consistent naming convention, such as $script_name.sh.
  4. Version Control: Store scripts in a version control system, such as Git.
  5. Change Management: Implement a change management process to track changes to scripts.

Security Standards

  1. Input Validation: Validate all user input to prevent injection attacks.
  2. Secure Password Storage: Store sensitive data, such as passwords, securely using tools like openssl or ssh-agent.
  3. Limit Privileges: Run scripts with the minimum required privileges.
  4. Logging: Implement logging to track script execution and errors.

Best Practices

  1. Keep it Simple: Keep scripts simple and focused on a single task.
  2. Test Thoroughly: Test scripts thoroughly before deployment.
  3. Use Functions: Use functions to organize code and reduce duplication.
  4. Document Code: Document code using comments and clear variable names.

Tools and Utilities

  1. ShellCheck: Use ShellCheck to lint and validate shell scripts.
  2. Bashlint: Use Bashlint to check bash scripts for errors and best practices.
  3. Git: Use Git for version control and change management.

Example Shell Script

#!/bin/bash
# Script header
# ================================================================================
# script_name: example.sh
# Description: An example shell script
# Author: Your Name <your@email.com>
# Date: 2023-02-20
# Version: 1.0
# ================================================================================
# Variables and constants
SCRIPT_DIR=$(dirname "$0")
LOG_FILE="$SCRIPT_DIR/example.log"
# Functions
log_message() 
  echo "$(date) - $1" >> "$LOG_FILE"
# Main script body
set -e
set -x
log_message "Script started"
# Your code here
log_message "Script completed"

By following these shell deployment standards, you can ensure that your shell scripts are written, deployed, and maintained in a consistent, reliable, and secure manner. shell dep standards

Most likely, you mean Shell’s Design and Engineering Practices (DEP). These are a set of technical standards used globally by Shell and its contractors for engineering design, material selection, safety, and project execution.

To give you the most useful output, could you clarify which of the following you need?

  1. An overview paper explaining what Shell DEP standards are, their purpose, structure (DEP categories like DEP 1, DEP 30, DEP 80), and how they’re used in oil & gas projects.
  2. A compliance or gap analysis paper comparing Shell DEPs to industry standards (ISO, API, ASME).
  3. A specific technical paper on a single DEP (e.g., piping material class, pressure vessels, corrosion control, or instrumentation).
  4. A template or guide for writing a paper about DEPs for internal training or project documentation.

If you just want a general introduction paper (e.g., for university or early-career engineers), I can write that for you now. Here’s a draft structure:

Title:
An Introduction to Shell Design and Engineering Practices (DEP) Standards

1. Abstract
Brief overview of DEPs as Shell’s proprietary technical standards, ensuring consistency, safety, and reliability across global projects.

2. Background

3. Structure of DEP Standards

4. Key Features

5. Examples

6. Application in Industry

7. Comparison with Other O&G Standards

8. Conclusion
DEPs as a benchmark for high-integrity engineering in upstream and downstream.

9. References (if needed, using public Shell documents or industry papers citing DEPs).

(Design and Engineering Practice) standards are a proprietary set of technical guidelines used by Shell and its authorized partners to standardize the design, construction, operation, and maintenance of oil, gas, and chemical facilities. They represent Shell’s accumulated engineering experience and are often based on or supplement international standards like ISO or API. Core Components of Shell DEPs

These standards are structured to ensure safety, efficiency, and technical consistency across global projects. They typically include: Design & Engineering Practices

: Detailed rules for specific disciplines such as piping, mechanical, electrical, and civil engineering. Standard Drawings Introduction Shell deployment standards are a set of

: Templates for common equipment and structural components like flanges, fittings, and mechanical symbols. MESC (Material and Equipment Standards and Code)

: A system for identifying and specifying materials and equipment, which works in tandem with DEPs to streamline procurement. Standard Requisitions and Forms

: Formalized documentation for ordering materials and managing project deliverables. Access and Usage

Because DEPs are Shell's intellectual property, they are not freely available to the public.

Part 10: Practical Advice for Engineering & Procurement Teams

5. Container / CI Standards

The command -v Standard

Avoid using which for checking dependencies. which is an external binary and may not exist on all minimal systems (e.g., minimal Docker containers). Use the built-in command -v.

Standard Pattern:

declare -a required_commands=("jq" "curl" "docker")

for cmd in "$required_commands[@]"; do
if ! command -v "$cmd" &> /dev/null; then
echo "Error: Required dependency '$cmd' is not installed or not in PATH."
exit 1
fi
done

Caching & CI

Quick checklist for PRs touching deps

Navigating the Rigorous World of Shell DEP Standards: A Blueprint for Engineering Excellence

Level 2: Discipline Practices

These form the bulk of DEPs, broken down by engineering discipline: