topic How to configure $REMOTEHOST env variable ? in Operating System - HP-UX

How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Fri, 16 May 2008 10:26:05 GMT

Hi,

By default my HP UX m/c doesn't configure $REMOTEHOST variable. How can I configure REMOTEHOST variable ? Pls help me.

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

Pete Randall — Fri, 16 May 2008 10:35:35 GMT

I'm afraid we need more details of what you are trying to accomplish and what you expect this variable to contain before we can be of much help.

Pete

Re: How to configure $REMOTEHOST env variable ?

Yogeeraj_1 — Fri, 16 May 2008 10:42:05 GMT

hi,

Pete is right! Unless, you know what this variable meaning is, you cannot define it.

If you want to explicitly define this variable, you must execute the following commands:
REMOTEHOST=
export REMOTEHOST

You may also wish to include this in your .profile or /etc/profile

hope this helps!
kind regards
yogeeraj

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Fri, 16 May 2008 10:56:03 GMT

Hi,

Sorry for insufficient information.

By default, the $REMOTEHOST env variable is set in the linux env. The $REMOTEHOST variable has the name of the remote host which connected to a linux m/c.

I am trying to get name of the remote m/c which connected to a hpux m/c.This will help to monitor the remote host activities. Hope this clear.

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Fri, 16 May 2008 10:56:10 GMT

Hi,

Sorry for the insufficient information.

By default, the $REMOTEHOST env variable is set in the linux env. The $REMOTEHOST variable has the name of the remote host which connected to a linux m/c.

I am trying to get name of the remote m/c which connected to a hpux m/c.This will help to monitor the remote host activities. Hope this clear.

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

Dennis Handly — Fri, 16 May 2008 11:07:47 GMT

>I am trying to get name of the remote m/c which connected to a hpux m/c.

Something like:
who -a | awk -v user=$LOGNAME '$0 ~ user {print $NF}'

Re: How to configure $REMOTEHOST env variable ?

James R. Ferguson — Fri, 16 May 2008 11:13:42 GMT

Hi Ramesh:

> Dennis: who -a | awk -v user=$LOGNAME '$0 ~ user {print $NF}'

I think Dennis meant 'who -u' as:

# who -u | awk -v user=$LOGNAME '$0 ~ user {print $NF}'

Regards!

...JRF...

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Fri, 16 May 2008 11:29:32 GMT

Hi Dennis / JRF,

Thanks for the response. The following command gives all the m/c names which are currently connected.

who -u | awk -v user=$LOGNAME '$0 ~ user {print $NF}'

But I require the remote m/c name of the current terminal/telnet. I do not require all the remote host names. I am currently working on monitoring of user activities. Please refer the following thread for complete details about the functionality. And also please search REMOTEHOST string in the attachment of that thread. I need to set the exact m/c name into that variable.

http://forums12.itrc.hp.com/service/forums/questionanswer.do?threadId=1232079

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

Dennis Handly — Sat, 17 May 2008 05:11:50 GMT

>The following command gives all the m/c names which are currently connected.

Yes, for that user.

>But I require the remote m/c name of the current terminal/telnet.

Ok, you can use this script:
#!/usr/bin/ksh
# Find source machine from tty(1)
TTY=$(tty) # issue with pipes
who -u | awk -v tty=$TTY '
BEGIN { tty = substr(tty, 6) } # strip /dev/
$0 ~ tty {print $NF}'

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Sat, 17 May 2008 05:25:59 GMT

Hi Dennis,

The script does not give any output. I have saved the script commands in a file named a.sh and I executed it by "$sh a.sh". It does not print anything in the console. Am I miss anything ?

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Sat, 17 May 2008 06:15:23 GMT

Hi Dennis,

For your quick reference, my console output of "who -u" command is,

bash-3.00$ who -u
test pts/ta May 1 18:15 . 15226 MEPS1.india.adventnet.com
test pts/tb May 16 15:16 21:10 22735 rameshj.india.adventnet.com
test pts/tc May 17 11:36 0:04 12941 rameshj.india.adventnet.com
test pts/td May 15 15:06 0:09 23817 opman-sigma1.india.adventnet.com
guest pts/0 May 17 10:41 old 11028 assetmgmt-test1.india.adventnet.com
test pts/te May 17 12:23 . 14597 rameshj.india.adventnet.com
test pts/tf May 16 16:35 19:53 26126 rameshj.india.adventnet.com
guest pts/1 Apr 29 01:41 old 20391 console-server.india.adventnet.com
guest pts/2 Apr 29 01:41 old 20402 console-server.india.adventnet.com

My HPUX version is, B.11.11

This may help you to identify the issue.

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

Dennis Handly — Sat, 17 May 2008 06:15:27 GMT

>The script does not give any output.

It worked fine for me, after a lot of tweaking. :-)

>I executed it by "$sh a.sh". It does not print anything in the console. Am I miss anything?

That should be it. But you could make it executable so you don't need to use "sh".

Add this echo here:
TTY=$(tty) # issue with pipes
echo "TTY is: $TTY"

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Sat, 17 May 2008 06:22:29 GMT

Hi Dennis,

After adding the echo the script output is,

bash-3.00$ ./a.sh
TTY is: /dev/ttyp6
bash-3.00$

I could not find any information related to tty in the who -u command output. This may be configuration issue. But I am sure.

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

Dennis Handly — Sat, 17 May 2008 07:18:35 GMT

>For your quick reference, my console output of "who -u" command is,

Thanks. I don't see your tty there.

>I could not find any information related to tty in the who -u command output.

It talks about "line". There is also mention about using -R with -u but I don't see much difference.

What do you get for: pty
And: ll -i /dev/ttyp6

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Sat, 17 May 2008 08:38:24 GMT

Hi Dennis,

Following are the output of the required commands,

bash-3.00$ pty
/dev/ttyp6
bash-3.00$ ll -i /dev/ttyp6
822 crw--w---- 2 test tty 17 0x000006 May 17 14:55 /dev/ttyp6
bash-3.00$

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

Dennis Handly — Sat, 17 May 2008 08:54:35 GMT

>Following are the output of the required commands
>$ ll -i /dev/ttyp6
822 crw--w---- 2 test tty 17 0x000006 May 17 14:55 /dev/ttyp6

Perhaps there are two names for this tty? How about:
$ find /dev -inum 822

(On my system the basenames of the files match.)

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Sat, 17 May 2008 08:58:34 GMT

Following are the output of find command,

# find /dev -inum 822
/dev/pty/ttyp6
/dev/ttyp6
#

Re: How to configure $REMOTEHOST env variable ?

Dennis Handly — Sat, 17 May 2008 09:32:54 GMT

>Following are the output of find command,
>/dev/pty/ttyp6 /dev/ttyp6

Hmm, I'm not sure how to map these BSD pseudo terminals to your Streams pseudo-terminals.
Looking at pts(7) ptm(7) pty(7) doesn't mention it.

You might be able to map the time stamp on ttyp6 with one in the /dev/pts/ directory???

Re: How to configure $REMOTEHOST env variable ?

J Ramesh Kumar — Sat, 17 May 2008 09:58:37 GMT

Hi,

If the script suggested by you is working fine for most of the HP UX system, I may go with that script. In case of any issue in finding remote host(like my local HP UX m/c), my application log will be reported as "Unknown Host". But I would like convert your script into 2 lines and assign the host name into a variable named REMOTEHOST. Is the following 2 lines working fine in ur m/c ? ie, the REMOTEHOST variable is properly assigned with actual value. This will help me integrate the same.

TTY=$(tty) # issue with pipes
REMOTEHOST=`who -u | awk -v tty=$TTY 'BEGIN { tty = substr(tty, 6) } $0 ~ tty {print $NF}'`

Since the issue in my m/c may be due to configuration issue, we will try to identify the issue in parallel.

I really appreciate your great support and effort on resolving the issue. Thank you very much.

Thanks,
Ramesh

Re: How to configure $REMOTEHOST env variable ?

Dennis Handly — Sat, 17 May 2008 10:24:02 GMT

>Is the following 2 lines working fine in your m/c? ie, the REMOTEHOST variable is properly assigned with actual value.

Yes. But you shouldn't use the obsolete ``.
Use this one liner:
REMOTEHOST=$(TTY=$(tty); who -u | awk -v tty=$TTY 'BEGIN { tty = substr(tty, 6) } $0 ~ tty {print $NF}')

Note you don't really need to put this all on one line. You can do:
REMOTEHOST=$(TTY=$(tty)
who -u |
awk -v tty=$TTY '
BEGIN { tty = substr(tty, 6) }
$0 ~ tty {print $NF}')