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cron-block-generation-gotchas

Diagnose and fix cron blocks failing from shell splitting and stripped PATH environments.

Updated Nov 18, 2025
Search Tags:#debugging#macos#cron#crontab#path#shell quoting
One-click install
npx skills add https://github.com/cajias/claude-skills --skill cron-block-generation-gotchas
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: cron-block-generation-gotchas
Source: https://github.com/cajias/claude-skills/tree/main/plugins/ci-build/skills/cron-block-generation-gotchas
Command: npx skills add https://github.com/cajias/claude-skills --skill cron-block-generation-gotchas

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps diagnose and prevent cron jobs that appear correctly installed but never actually run, especially when paths contain spaces or when cron cannot find user-installed binaries because of its minimal environment.

Core Features & Use Cases

  • Cron quoting fixes: Safely generate cron command lines that preserve paths with spaces and special characters.
  • PATH handling: Add the right environment PATH for tools installed in user-specific locations such as local bin directories or package manager paths.
  • Silent failure debugging: Reproduce cron’s stripped-down environment locally, inspect cron logs, and distinguish command-line bugs from daemon or permission issues.
  • Mac-specific validation: Account for Full Disk Access and other macOS cron limitations that can block scheduled jobs without obvious errors.

Quick Start

Ask the skill to review your cron block or scheduled command and rewrite it so it is correctly quoted, has a valid PATH, and can be tested in cron’s reduced environment.

Frequently Asked Questions about cron-block-generation-gotchas

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why does my cron job work in the terminal but fail silently when scheduled?▼

Cron jobs fail silently because cron runs with a stripped-down environment and minimal PATH, meaning it cannot find user-installed binaries or interpret shell splitting the same way as an interactive terminal session.

How do I fix crontab entries with file paths that contain spaces?▼

To fix crontab entries with spaces, apply shell-safe quoting to your command block so that paths are preserved during shell splitting and the scheduled job executes the correct executable.

How do I reproduce cron's reduced environment to debug a failing scheduled job?▼

Reproduce cron's reduced environment locally by simulating its stripped PATH and minimal variables, allowing you to validate command execution and distinguish command-line bugs from daemon or permission issues.

Does macOS block cron jobs from running without showing errors?▼

macOS blocks cron jobs silently due to Full Disk Access restrictions and other daemon limitations, preventing scheduled jobs from firing without obvious errors unless proper permissions are configured.

What's the best way to add a local bin directory to the PATH for a cron job?▼

The best way to add local bin directories to a cron job PATH is to explicitly set the environment variable within the crontab or script, ensuring package manager binaries are discoverable during execution.

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