On Wed, Nov 4, 2009 at 1:33 PM, Bryn M. Reeves <bmr(a)redhat.com>
wrote:
> On Wed, 2009-11-04 at 13:13 +0000, Dan Track wrote:
>> On Wed, Nov 4, 2009 at 1:10 PM, Dan Track <dan.track(a)gmail.com> wrote:
>>> Hi,
>>>
>>> I'm running a command like this:
>>>
>>> for i in server1 server2;do ssh root@$i "`hostname`";done.
>>>
>>> However the hostname command always outputs the hostname of the server
>>> that the above command is run from. I'd like to know how to run this
>>> hostname command so that it actually runs on server 1, server2 etc..
>>>
>>> Thanks
>>> Dan
>>>
>> Sorry just to add the actual script was like this:
>>
>> for i in server1 server2;do ssh root@$i "DNSNAME=\"basename
>> \`hostname\`\";echo $DNSNAME";done
> Not sure why you're setting a variable here but to have "basename" run
> as a command and assign the output to DNSNAME you need to have basename
> inside a pair of backticks too.
>
> You'll then hit another problem because you want to have nested
> backticks (one pair for basename and another for hostname). Bash
> supports '$()' as an alternative to backticks that does allow nesting -
> writing $(hostname) is equivalent to `hostname` and allows you to write
> $(basename $(hostname)).
>
> I'm not sure basename is going to do what you want here though - are you
> looking for the short host name or the domain name? The basename command
> separates components of a path based on the '/' (or whatever the system
> defined path separator is). E.g.:
>
> $ DNS=$(basename $(hostname))
> $ echo $DNS
>
breeves.fab.redhat.com
>
> If you just want the short hostname you can pass -s to hostname:
>
> $ ssh pe1950-1.gsslab hostname -s
> pe1950-1
>
> Or the domain with -d:
>
> $ ssh pe1950-1.gsslab hostname -d
>
gsslab.fab.redhat.com
>
> Have a look at the man page for hostname for more options.
>
> Regards,
> Bryn.
Hi Bryn,
Many thanks. I tried hostname -s but I keep getting the following:
hostname: Host name lookup failure
This may be because the hostname's are short already e.g just
"server1" instead of "server1.example.com"
I've updated teh script to your recommendations but I still get the
local hosts hostname in teh output instead of the remote servers
hostname. Any other thoughts?
I now run the following:
for i in server1 server2;do ssh root@$i "DNSNAME=$(basename
$(hostname)$);echo $DNSNAME";done
A A
| |
what is that? |
|
need a backslash before the $
--
Bill Davidsen <davidsen(a)tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot