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Full Discussion: Error when running script involving machine name and local network
Top Forums UNIX for Beginners Questions & Answers Error when running script involving machine name and local network Post 303044858 by honeyhamlet on Thursday 5th of March 2020 10:57:53 AM
Old 03-05-2020
Error when running script involving machine name and local network
Hi everyone, I'm trying to write a script that takes a machine name as a command line argument and displays a message informing me whether the host is on the local network.

Here's what I have:

Code:
#!/bin/bash
gateway=$(ip route | grep default | cut -d' ' -f3)

if [[ $(ip route get "$1" | grep -q $gateway) ]]; then

echo "$1 is on the local network"

else

echo "$1 is not on the local network"

fi

Whenever I run it with my machine name (ubuntu) I get the following output:

Code:
Error: any valid prefix is expected rather than "ubuntu".
ubuntu is not on the local network

I'm not sure what the error means and why I'm getting it, as well as if the script is even doing what it should be doing. Any advice would be appreciated. Thanks!
 

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LEARN ABOUT HPUX

ruptime

ruptime(1)						      General Commands Manual							ruptime(1)

NAME

       ruptime - show status of local machines

SYNOPSIS

DESCRIPTION

       outputs	a  status  line  for each machine on the local network that is running the daemon.  status lines are formed from packets broadcast
       once every 3 minutes between daemons (see rwhod(1M)) on each host on the network.  Each status line  has  a  field  for	the  name  of  the
       machine, the status of the machine (up or down), how long the machine has been up or down, the number of users logged into the machine, and
       the 1-, 5- and 15-minute load averages for the machine when the packet was sent.

       The status of the machine is reported as ``up'' unless no report has been received from the machine for 11 minutes or more.

       The length of time that the machine has been up is shown as:

       Load averages are the average number of jobs in the run queue over the last 1-, 5- and 15-minute intervals when the packet was sent.

       An example status line output by might be:

       The above status line would be interpreted as follows:

       is presently ``up'' and has been up for 1 day, 5 hours and 15 minutes.  It currently has 7 users logged in.  Over the last 1-minute  inter-
       val,  an average of 1.47 jobs were in the run queue.  Over the last 5-minute interval, an average of 1.16 jobs were in the run queue.  Over
       the last 15-minute interval, an average of 0.80 jobs were in the run queue.

       If a user has not used the system for an hour or more, the user is considered idle.  Idle users are not shown unless the option	is  speci-
       fied.

   Options
       If no options are specified, the listing is sorted by host name.  Options change sorting order as follows:

	      Sort by load average.

	      Sort by up time.

	      Sort by the number of users.

	      Reverse the sort order.

DIAGNOSTICS

       No status report files in
	    Ask the system administrator to check whether the daemon is running.

AUTHOR

       was developed by the University of California, Berkeley.

FILES

       Data files

SEE ALSO

       rwho(1), rwhod(1M).

																	ruptime(1)
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