The other node name of a SUN cluster


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# 1  
The other node name of a SUN cluster

Hello,

Under ksh I have to run a script on one of the nodes of a Solaris 8 cluster which at some time must execute a command on the alternate node:
# rsh <name> "command"

I have to implement this script on all the clusters of my company (a lot of...).
Fortunately, the names of the two nodes obey the following rule: a common string excepting the last character which is 1 on one node and 2 for the other.
I don't want to read the names of the machines in /etc/hosts which is really a mess on some clusters... (obsolete names etc.)

I thought to the following solution:

1. Read in a variable the name of the current node (uname ... ?!?)

2. In the script I added a part that get from the current node name the other node name. From some reason... when I run from the ksh the commands one by one it works fine:

Code:
root@carp # X=abc12
root@carp # numofchar=${#X}
root@carp # numofcharminus1=`expr $numofchar "-" 1`
root@carp # Y=`echo "$X" | cut -c1-${numofcharminus1}`
root@carp # Z=`echo "$X" | cut -c${numofchar}`
root@carp # T=`expr 3 "-" $Z`
root@carp # echo $Y$T
abc11

but when I insert them in the script I got error messages like:

Y=`echo "$X" | cut -c1-${numofcharminus1}`
cut - invalid range

T=`expr 3 "-" $Z`
invalid expression

I don't use scripting too often but I can't see what's wrong in my solution... a CR rule/type conversion... I am too tired and I must finish it until tommorow so please can someone help me! Maybe someone forsee another solution?

Regards

Last edited by heartwork; 10-08-2006 at 04:28 PM..
# 2  
The other node name in a SUN cluster

Hello,

Under ksh I have to run a script on one of the nodes of a Solaris 8 cluster which at some time must execute a command on the alternate node:
# rsh <name> "command"

I have to implement this script on all the clusters of my company (a lot of...).
Fortunately, the names of the two nodes obey the following rule: a common string excepting the last character which is 1 on one node and 2 for the other.
I don't want to read the names of the machines in /etc/hosts which is really a mess on some clusters... (obsolete names etc.)

I thought to the following solution:

1. Read in a variable the name of the current node (uname ... ?!?)

2. In the script I added a part that get from the current node name the other node name. From some reason... when I run from the ksh the commands one by one it works fine:

Code:
root@carp # X=abc12
root@carp # numofchar=${#X}
root@carp # numofcharminus1=`expr $numofchar "-" 1`
root@carp # Y=`echo "$X" | cut -c1-${numofcharminus1}`
root@carp # Z=`echo "$X" | cut -c${numofchar}`
root@carp # T=`expr 3 "-" $Z`
root@carp # echo $Y$T
abc11

but when I insert them in the script I got error messages like:

Y=`echo "$X" | cut -c1-${numofcharminus1}`
cut - invalid range

T=`expr 3 "-" $Z`
invalid expression

I don't use scripting too often but I can't see what's wrong in my solution... a CR rule/type conversion... I am too tired and I must finish it until tommorow so please can someone help me! Maybe someone forsee another solution?

Regards

Last edited by heartwork; 10-08-2006 at 04:18 PM..
# 3  
This looks just like this thread. I believe that's against rule #4.
Quote:
(4) Do not 'bump up' questions if they are not answered promptly. No duplicate or cross-posting and do not report a post where your goal is to get an answer more quickly.
# 4  
Sorry I had no intention... I am searching desperately an answer to my problem... even it might be easy...

Quote:
Originally Posted by nathan
This looks just like this thread. I believe that's against rule #4.
# 5  
Can you post your script? Just cut-and-paste it. ( Be sure and use code tags. )
# 6  
Since you are using ksh, you can use this bit:
Code:
thishost=$(uname -n)
basehost=${thishost%[0-9]}
thissuffix=${thishost##*[a-z][0-9]}
thatsuffix=$((3-$thissuffix))
thathost=${basehost}${thatsuffix}
echo $thathost

Hope this helps. Pretty much the best that I can think of right now...

Cheers
# 7  
Duplicate threads have been merged.
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