Sleep timer based on hostname Post: 302692731

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Top Forums Shell Programming and Scripting Sleep timer based on hostname Post 302692731 by deunan on Tuesday 28th of August 2012 04:55:28 AM

08-28-2012

Registered User

Sleep timer based on hostname

Dear all

I have a bunch of hosts which I need to run a common script. I need a sleep timee which will delay the execution based on the hostname. Usually the hostname of the servers are host01, host02 .. host16 with which I cam up with this -

Code:

#!/bin/bash
sleeptimer=$(( $(hostname -s|tr -cd 0-9|sed -e 's/^0//') * 60)) 2> /dev/null
#echo $sleeptimer

if [ -z "$sleeptimer" ]
then
	sleeptimer=$RANDOM
	while [ $sleeptimer -gt 3600 ]; do
		sleeptimer=$RANDOM
	done

fi
#sleep $sleeptimer
echo $sleeptimer

The second line works perfectly if the hostname is as previously mentioned with names host01, host02 .. host16.

What if the hostname is simply a generic name without any numbers are the end, I thought of simply generating a number.

Problem is, when the script is executed, I get this error-message

Code:

line 2: * 60: syntax error: operand expected (error token is "* 60")

I've even added "2> /dev/null" at the end of line 2 and it stlll generate the above errors. This only happens on hosts with hostnames *without* tail-numbers

Works fine otherwise ;-)

Appreciate any inputs!

Last edited by deunan; 08-28-2012 at 06:11 AM..

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LEARN ABOUT SUNOS

check-hostname

check-hostname(1M)					  System Administration Commands					check-hostname(1M)

NAME

       check-hostname - check if sendmail can determine the system's  fully-qualified host name

SYNOPSIS

	/usr/sbin/check-hostname

DESCRIPTION

       The   check-hostname script is a migration aid for sendmail(1M).  This script tries to determine the local host's fully-qualified host name
       (FQHN) in a manner similar to  sendmail(1M). If	check-hostname is able to determine the FQHN of the local host, it reports success. Other-
       wise,  check-hostname reports how to reconfigure the system so that the	FQHN can be properly determined.

FILES

       /etc/hosts	       Host name database

       /etc/nsswitch.conf      Name service switch configuration file

       /etc/resolv.conf        Configuration file for name server routines

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsndmu 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sendmail(1M), hosts(4), attributes(5)

SunOS 5.10							    10 Nov 2003 						check-hostname(1M)