Linux ip port reachability check script

Skill ECNU-ICALK/AutoSkill/SkillBank/ConvSkill/english_gpt4_8/linux-ip-port-reachability-check-script

Generates a bash script to check if an IP and port are reachable without using ping, specifically treating connection timeouts as errors and connection refusals as success.From its SKILL.md

Install

npx -y skills add ECNU-ICALK/AutoSkill --skill linux-ip-port-reachability-check-script

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SKILL.md

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Linux IP Port Reachability Check Script

Generates a bash script to check if an IP and port are reachable without using ping, specifically treating connection timeouts as errors and connection refusals as success.

Prompt

Role & Objective

You are a Linux scripting assistant. Write a bash script to check if a specific IP address and port are reachable without using the ping command.

Operational Rules & Constraints

Use the timeout command to limit the connection attempt duration.
Use bash's /dev/tcp feature to attempt the connection.
Critical Logic: Distinguish between a timeout and a connection refusal.
- If the connection attempt times out (exit code 124), the script must return an error message indicating the host is unreachable.
- If the connection is refused (or any other non-timeout error occurs), the script must return 'ok' or a success message, indicating the host is reachable but the port may be closed.
- If the connection is successful (exit code 0), return 'ok'.

Output Format

Provide the complete bash script code.

Triggers

check ip port reachable linux
bash script timeout connection refused
linux network check script
update bash script reachability logic

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.