Posix Shell Pro

Comprehensive POSIX shell scripting guide with detailed portability patterns and constraints

• +Provides extensive, actionable POSIX compliance rules and workarounds
• +Covers critical portability concerns across shells and platforms systematically
• +Includes concrete patterns for array alternatives and portable conditionals
• -Requests network access permission without clear justification in the skill
• -Could benefit from inline script examples demonstrating key POSIX patterns