Re: Can't use sshlogin host with underscore in name

[Gary Johnson]

On 2022-10-20, Christopher Fredén wrote:
> Hello,
> 
> When I run `parallel -S hello_you.com echo {} ::: hej` for example.
> 
> I get the following output:
> 
> ```
> parallel: This should not happen. You have found a bug. Please follow
> https://www.gnu.org/software/parallel/man.html#REPORTING-BUGS
> 
> Include this in the report:
> * The version number: 20220322
> * The bugid: SSHLogin parser failed on 'hello_you.com' => '_you.com'
> * The command line being run
> * The files being read (put the files on a webserver if they are big)
> 
> If you get the error on smaller/fewer files, please include those instead.
> ```
> 
> When I run the same command with a hostname without underscore it works just
> fine.
> 
> I couldn't find anyone reporting this error online, I'm I doing something 
> wrong
> or is this a bug?

Underscore is not a valid character in a host name, although some
operating systems allow it in local host names.  See, for
example,
https://stackoverflow.com/questions/3523028/valid-characters-of-a-hostname.

Regards,
Gary