topic Re: script question in Operating System - HP-UX

script question

Hunki — Mon, 19 Feb 2007 12:35:45 GMT

I have this script in which whenever I am trying to run it on hosta it does an equal for hostb and fails ...let me show u the set -x output :

+ uname -n
+ [ hosta = hostb ]

I have the if statement in the script for this which is failing :

if [ `uname -n` = hostb ]
then
...
else
# should execute stuff meant for hosta
fi

Its weird in a sense that most of my other scrips are scripted the same way and I even tried having a variable for the uname -n command but it would still equal the wrong box.

Re: script question

Hunki — Mon, 19 Feb 2007 13:03:38 GMT

In fact I tried ( if then else fi ) with a sample script and do get the same message for set -x ( I mean hosta = hostb ) and it runs fine after that , so there is probably something wrong in my script after else.

Re: script question

Bill Hassell — Mon, 19 Feb 2007 13:03:42 GMT

The statement:

if [ `uname -n` = hostb ]

is better written:

if [ $(uname -n) = hostb ]

as the backticks (aka, grave accent) have been deprecated for many years.

As far as a failed match, uname -n reports what it was set to in the startup config file /etc/rc.config.d/netconf. On the machine that is failing, uname has been been set to an unexpected value. Scripting won't fix this because the box is misconfigured. uname -n is *NOT* connected with DNS (see the man page for uname). By convention the Internet name and uname will be the same but there is no restriction to make them different.

Re: script question

Sandman! — Mon, 19 Feb 2007 13:07:54 GMT

Try replacing `uname -n` with $(uname -n) and make sure spacing is correct.

Re: script question

A. Clay Stephenson — Mon, 19 Feb 2007 13:11:53 GMT

Always identify your shell when asking a question like this.

In any event, if the situation is as described, the else part should be executing.

Try this (and apply some discplined quoting which you are missing):

if [ "$(uname -n)" = "hostb" ]
then
...
else
...
fi

or better still if using the Korn of POSIX shell:
if [[ "$(uname -n)" = "hostb" ]]
then
...
else
...
fi

Re: script question

Arturo Galbiati — Tue, 20 Feb 2007 04:22:18 GMT

Hi,
use:
if [[ $(hostname) = hostb ]]

or

if [[ $(uname -n) = hostb ]]

HTH,
Art