netdev - Report on Abnormal Behavior of "ip help" Command

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Date: Sat, 27 Jan 2024 14:17:59 +0800
From: "陈嘉昀" <jiayunchen@...il.nju.edu.cn>
To: "netdev" <netdev@...r.kernel.org>
Subject: Report on Abnormal Behavior of "ip help" Command

To whom it may concern,

I hope this email finds you well. I am writing to report a behavior which seems to be abnormal. I have observed "ip help" returns -1 (255), even if the help information is printed to the terminal successfully.

This is potentially causing trouble when we're automatically checking whether a tool is basically working, by checking its return code (normally, like coreutils tools, --help returns 0). Is that better to make it return 0 on help, or keep -1 to make it backward compatible?

The information on my working environment is: Ubuntu22.04, iproute2-5.15.0, libbpf 0.5.0.

Thank you for your time and efforts, I am looking forward to your reply.

Best regards,
Chen Jiayun