[NTLUG:Discuss] Scripting help

[Leroy Tennison]

Eric's approach worked, thanks:

hostlist=""
while read host; do hostlist="$hostlist $host"; done
(paste the line-delimited lists of hosts followed by a Ctrl-D here)
for i in $hostlist; do telnet $i; done

On 09/26/2014 09:50 PM, Leroy Tennison wrote:
> Thanks for your reply.  In response to your first question, the script 
> is hosted on the system I'm connecting to via ssh.  More specifically, 
> the local host is Windows, the ssh client is Putty and only the remote 
> system is Linux.  I do not have file system write access on the Linux 
> machine which makes things challenging. I write the script 
> interactively, pasting in my list at the appropriate place.
>
> I "played around" with your final script and may have come up with a 
> solution:
>
> hosts="host1
> host2
> host3";
> for i in $hosts; do echo aaa $i bbb; done                (I'm testing 
> from home where no host list exists so 'echo aaa $i bbb' shows the 
> command)
>
> What I got was:
>
> aaa host1 bbb
> aaa host2 bbb
> aaa host3 bbb
>
> which looks like what I want.  A test Monday will tell...
>
> On 09/26/2014 10:03 AM, Eric Schnoebelen wrote:
>> Leroy Tennison writes:
>> - I'm trying to get telnet to repetitively connect to a 
>> newline-delimited
>> - list of devices.  In other words, if I have device1, device2 and 
>> device3
>> - then what I want is:
>> -
>> - telnet device1
>> - telnet device2
>> - telnet device3
>> -
>> - I've used three devices as an example but my lists are much longer. 
>> For
>> - reasons too complicated to go into, this has to be done via ssh to a
>> - Linux machine where I have no file system access (so the list has 
>> to be
>> - pasted into the script interactively).
>>
>> Is the script hosted locally or on the system you're using SSH
>> to connect too?
>>
>> If the script, and the list of devices are in files locally,
>> something like this could work:
>>
>>      for h in  host1 host2.. ; do
>>     ssh gateway telnet $h
>>      done
>>
>> If the script is remote, but can take an argument set (aka, it
>> looked like this:
>>      for h in "$@"; do
>>     telnet $h
>>      done
>> )
>>
>> it could be called as
>>
>>      ssh gateway <script> $(cat <devices>)
>>
>> - I've tried using grave around the list and setting IFS to a space with
>> - similar results.  I considered using 'read' but have initially decided
>> - against it because I don't want the script constrained to a given 
>> number
>> - of list entries.
>>
>> Why would using read constrain you to a limited number of
>> entries?  Here's a small shell program to keep gobbling the read
>> values, and turn it into a single variable that can be parsed by
>> the for subcommand:
>>
>>      hosts=""
>>      while read host ; do
>>     hosts="$hosts '$host'"
>>      done
>>      for h in $hosts; do
>>     telnet $h
>>      done
>>
>> -- 
>> Eric Schnoebelen        eric at cirr.com        http://www.cirr.com
>>     Five boxes preserve our freedoms:
>>             soap, ballot, witness, jury, and cartridge
>>
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>> http://www.ntlug.org/mailman/listinfo/discuss
>>
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