On 17 Jan 1996, I wrote:
>Hi,
>Does anyone know how to determine the local node name after a rlogin to
>another host. I would like to be able to setenv DISPLAY to the local host
>automatically if possible. Any comments as to methods would be appreciated.
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I selected the following solution for our circumstances:
Given that we use DU csh as default I added the following line to the .cshrc
file inside
the if ($?prompt) conditional statement. (So errors did not appear on
dxconsole with no display):
if ($?prompt) then
.....
setenv DISPLAY `who -mM | awk '{print substr($6,2,length($6)-2)}'`:0.0
endif
Thanks to all that replied, gives you faith in Human-Kind.......
The mail responses received follow:
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Try
export DISPLAY=`who -mM | awk '{print substr($6,2,length($6)-2)}'`:0.0
Might only work on Digital UNIX though. Check out who for other options
that might be more compatible with other systems.
Regards,
Jon Buchanan, Zuerich, Switzerland
[ Jonathan.Buchanan_at_ska.com ]
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Host=`who -M am i | awk 'NF >= 6 {print substr($6,2,length($6)-2);}'`
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I think that the w(1) command gives you the info in the "from" field:
osfsable> w
13:12 up 18:24, 2 users, load average: 0.00, 0.00, 0.00
User tty from login_at_ idle JCPU PCPU what
benoit p1 sand2 13:11 w
You just need to grep the username and awk for the 3rd field.
Regards,
Benoit Maillard
maillard_at_fgt.dec.com
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DISPLAY=`hostname`
export DISPLAY
Ross Alexander, ve6pdq -- (403) 675 6311 -- rwa_at_cs.athabascau.ca
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It will be done automatically in DU 4.0 if the rlogin comes from a UNIX
computer.
Daniel
o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o
| Daniel Clar
e-mail : Daniel.Clar_at_supelec.fr |
| Computer Operations Manager
: dc_at_supelec.fr
|
| Service Informatique Supelec
and
|
| Plateau de Moulon
DECUSF::CLAR_D or clar_d_at_decus.fr |
| 91192 Gif sur Yvette Cedex - France
|
| Tel : (33 1) 69 85 14 87
Fax : (33 1) 69
85 12 34 |
o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o
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Search archie for xrsh
*** using csh do not have xrsh. Thanks.
Henning Fruechtenicht fruechtenicht_at_rz.fh-wilhelmshaven.de
Rechenzentrum Tel.: +49 4421 985323
FH Wilhelmshaven Fax.: +49 4421 81950
Friedrich-Paffrath-Str. 101
D-26389 Wilhelmshaven
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One shell, tcsh, does this automatically and sets REMOTEHOST to the
calling machine's hostname. You can find it at tesla.ee.cornell.edu in
/pub/tcsh. GNU bash probably does that too. Both are superior shells
with respect to the standard csh and sh but should _not_ be used for
the root account.
Ciao,
Arrigo
Arrigo Triulzi <arrigo_at_lpac.ac.uk> - +44-171-775-3247
London Parallel Applications Centre - London E1 4NS - UK
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It purely depends on the OS being run on the machine that you are rlogin
in to. Some systems will display who is logged in from where with the
who(1) command. You can use `who am i` to obtain this. On some systems
like SCO v.3, there is no way of detecting this apart from mind-blowing
parsing of the utmp entries, and the netstat listing of socket connections!
Dave Roberts | "Just paddling out into big
surf is a total
Unix Systems Administrator | commitment" * "You can't just call
time-out
SAA Consultants Ltd | and stroll on back to the beach if
you don't
Plymouth, UK <EDI Services> | like the way things are going" - Point Break
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I wrote a little C program which examines the utmp file and prints a
string to set the display variable.
It works for me.
Here is the source:
#include <stdio.h>
#include <utmp.h>
#include <unistd.h>
#include <string.h>
void main(void)
{
FILE *file;
char *lname, *ptr, *thetty=NULL;
struct utmp item;
int found=0, len;
lname=getlogin();
if(lname==NULL || (file=fopen(UTMP_FILE, "rb"))==NULL)
{
printf(":0.0\n");
exit(0);
}
len=strlen(lname);
if(isatty(STDIN_FILENO))
{
thetty=ttyname(STDIN_FILENO);
/* scan for '/' in ttyname */
if((thetty=strrchr(thetty, '/'))!=NULL)
{
thetty++;
}
}
if(thetty==NULL)
{
while(fread(&item, sizeof(item), 1, file)==1)
{
if(/*item.ut_type==USER_PROCESS &&*/
strncmp(lname, item.ut_name, len)==0)
{
found=1;
break;
}
}
}
else
{
while(fread(&item, sizeof(item), 1, file)==1)
{
if(/*item.ut_type==USER_PROCESS &&*/
strncmp(lname, item.ut_name, len)==0 &&
strcmp(thetty, item.ut_line)==0)
{
found=1;
break;
}
}
}
if(found)
{
item.ut_host[15]='\0';
if((ptr=strchr(item.ut_host, ':'))!=NULL)
{
*ptr='\0';
}
if((ptr=strchr(item.ut_host,'.'))!=NULL)
{
*ptr='\0';
}
ptr=item.ut_host;
while(*ptr==' ')
ptr++;
printf("%s:0.0\n", ptr);
}
else
{
printf(":0.0\n");
}
fclose(file);
exit(0);
}
Ciao
Andreas
**** Thanks for this I'm sure that someone who cannot use my chosen solution
to work will be greatful for this as I was. Phil P.
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| Dipl.-Ing. Andreas Heckwolf Voice :++49 69 798-28359 |
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+---------- E-Mail : andreas_at_tm.informatik.uni-frankfurt.de ------------+
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You can use "who -M" or $REMOTEHOST if you have tcsh.
Christophe.
*** I don't have tcsh, but Thanks Phil P.
Christophe DIARRA
I.P.N ORSAY
91406 ORSAY Cedex
Tel: (16 1) 69 41 65 60
E-mail: diarra_at_ipno.in2p3.fr
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How about the command "hostname"?
*** Not quite this simple I'm afraid, wish it was.
Sho...
Eric R Showalter
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Regards,
Phil Pidgeon
OTIS Engineering Center - Penang, Malaysia
ppidgeon_at_omc.otis.utc.com
Received on Fri Jan 19 1996 - 08:38:26 NZDT