Read Env Key

Environment Variable Key Reader

List environment variable keys without exposing their values. This skill provides safe access to environment variable names only.

Available Environment Variables

Current environment variable keys: !env | cut -d= -f1 | sort

Instructions

Use shell commands to list environment variable keys:

List all environment variable keys

env | cut -d= -f1 | sort

Filter environment variable keys

To filter keys by pattern (case-insensitive):

env | cut -d= -f1 | grep -i <pattern> | sort

Examples:

• env | cut -d= -f1 | grep -i GIT | sort - List all keys containing "GIT"
• env | cut -d= -f1 | grep -i GITHUB | sort - List all keys containing "GITHUB"
• env | cut -d= -f1 | grep -i TOKEN | sort - List all keys containing "TOKEN"

Check if a specific key exists

To check if a specific environment variable key exists:

if [ -n "${KEY_NAME+x}" ]; then echo "✓ KEY_NAME exists"; else echo "✗ KEY_NAME does not exist"; fi

Or using printenv:

if printenv KEY_NAME > /dev/null 2>&1; then echo "✓ KEY_NAME exists"; else echo "✗ KEY_NAME does not exist"; fi

Examples:

• if [ -n "${CODEMATE_GITHUB_TOKEN+x}" ]; then echo "✓ CODEMATE_GITHUB_TOKEN exists"; else echo "✗ CODEMATE_GITHUB_TOKEN does not exist"; fi
• if printenv API_KEY > /dev/null 2>&1; then echo "✓ API_KEY exists"; else echo "✗ API_KEY does not exist"; fi

Security Note

This skill is designed to ONLY read environment variable keys (names), never their values. This prevents accidental exposure of sensitive information like tokens, passwords, or API keys.

Prerequisites

• Must be run in a shell environment with environment variables set

Converted and distributed by TomeVault — claim your Tome and manage your conversions.