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Re: Use curl to check the status/availability of local/remote port(s).
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From: Daniel Stenberg via curl-users <curl-users_at_cool.haxx.se>
Date: Mon, 11 Jan 2021 22:25:01 +0100 (CET)
On Mon, 11 Jan 2021, Hongyi Zhao via curl-users wrote:
> Say, for checking the availability of telnet server, I can use nc as
> follows:
>
> $ nc -z hostIP 23
>
> But I want to know if I can do the same job with curl too.
You *can* but it won't be as convenient:
Is there a SSH port listening?
$ curl --http0.9 --connect-timeout 3 localhost:22 -s -o /dev/null
$ echo $?
56
Yes!
Is there a TELNET port listening?
$ curl --http0.9 --connect-timeout 3 localhost:23 -s -o /dev/null
$ echo $?
7
Nope.
Date: Mon, 11 Jan 2021 22:25:01 +0100 (CET)
On Mon, 11 Jan 2021, Hongyi Zhao via curl-users wrote:
> Say, for checking the availability of telnet server, I can use nc as
> follows:
>
> $ nc -z hostIP 23
>
> But I want to know if I can do the same job with curl too.
You *can* but it won't be as convenient:
Is there a SSH port listening?
$ curl --http0.9 --connect-timeout 3 localhost:22 -s -o /dev/null
$ echo $?
56
Yes!
Is there a TELNET port listening?
$ curl --http0.9 --connect-timeout 3 localhost:23 -s -o /dev/null
$ echo $?
7
Nope.
-- / daniel.haxx.se | Commercial curl support up to 24x7 is available! | Private help, bug fixes, support, ports, new features | https://www.wolfssl.com/contact/ ----------------------------------------------------------- Unsubscribe: https://cool.haxx.se/list/listinfo/curl-users Etiquette: https://curl.haxx.se/mail/etiquette.htmlReceived on 2021-01-11