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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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GDNC(1) 						       GNUstep System Manual							   GDNC(1)

NAME
gdnc - GNUstep Distributed Notification Center SYNOPSIS
gdnc DESCRIPTION
The gdnc daemon is used by GNUstep programs to send notifications and messages to one another. By default it uses private inter-process communications accessible only to the curtrent user on the machine on which it is running (where the operating system supports them). Every user needs to have his own instance of gdnc running. While gdnc will be started automatically as soon as it is needed, it is recom- mended to start gdnc in a personal login script like ~/.bashrc or ~/.cshrc. Alternatively (if you have no command-line tools which use distributed notifications) you can launch gdnc when your windowing system or the window manager is started. For example, on systems with X11 you can launch gdnc from your .xinitrc script or alternatively - if you are running Window Maker - put it in Window Maker's autostart script. See the GNUstep Build Guide for a sample startup script. OPTIONS
To attach gdnc to a remote session use the -NSHost hostname argument. To run a copy of the server to handle public notifications (available to all users on the local machine) -GSPublic YES To run a copy of the server to handle network-public notifications (available to all users able to connect to the local machine on the net- work) -GSNetwork YES DIAGNOSTICS
gdomap -L GDNCServer will lookup instances of gdnc which were launched with the NSHost, GSPublic, or GSNetwork command line arguments. Alternatively, gdomap -N will list all registered names on the local host. SEE ALSO
gdomap(8), GNUstep(7), gpbs(1) The GNUstep Build Guide example startup script: <http://gnustep.made-it.com/BuildGuide/index.html#GNUSTEP.SERVICES> HISTORY
Work on gdnc started October 1998. This manual page first appeared in gnustep-base 1.7.2 (July 2003). AUTHORS
gdnc was written by Richard Frith-Macdonald <rfm@gnu.org>. This man page was written by Martin Brecher <martin@mb-itconsulting.com>. GNUstep August 2003 GDNC(1)
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