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Top Forums UNIX for Beginners Questions & Answers Bash script for checking if a host is on the local network Post 303044998 by honeyhamlet on Tuesday 10th of March 2020 11:58:32 AM
Old 03-10-2020
Bash script for checking if a host is on the local network

I'm trying to write a script that allows you to enter your machine name, and then lets you know if the host is on the local network. Here's what I have:
Code:
#!/bin/bash
echo "Please enter the host you would like to ping:"

read host

if ping -c 1 -W 1 "$host";

    then

        echo "$host is up"

    else

        echo "$host is down"

fi

This allows me to enter my machine name (ubuntu) but doesn't actually let you know if it's on the local network or not (aside from looking at the IP and knowing that it's local).

I asked my TA for advice and after a week, his only response was 'ruptime.'

I'm not too sure how to incorporate that into a script that does what the question is asking. Any help or advice would be appreciated. Thanks!
 

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brlapi_connectionSettings_t(3)					      BrlAPI					    brlapi_connectionSettings_t(3)

NAME
brlapi_connectionSettings_t - Settings structure for BrlAPI connection. SYNOPSIS
#include <brlapi.h> Data Fields char * auth char * host Detailed Description This structure holds every parameter needed to connect to BrlAPI: which file the authorization key can be found in and which computer to connect to. Examples: brlapi_connectionSettings_t settings; settings.auth='/etc/brlapi.key'; settings.host='foo'; libbrlapi will read authorization key from file /etc/brlapi.key and connect to the machine called 'foo', on the default TCP port. settings.host='10.1.0.2'; lets directly enter an IP address instead of a machine name. settings.host=':1'; lets libbrlapi connect to the local computer, on port BRLAPI_SOCKETPORTNUM+1 See Also: brlapi_openConnection() Field Documentation char* brlapi_connectionSettings_t::auth For security reasons, libbrlapi has to get authorized to connect to the BrlAPI server. This can be done via a secret key, for instance. This is the path to the file which holds it; it will hence have to be readable by the application. Setting NULL defaults it to local installation setup or to the content of the BRLAPI_AUTH environment variable, if it exists. char* brlapi_connectionSettings_t::host This tells where the BrlAPI server resides: it might be listening on another computer, on any TCP port. It should look like 'foo:1', which means TCP port number BRLAPI_SOCKETPORTNUM+1 on computer called 'foo'. Note: Please check that resolving this name works before complaining Settings NULL defaults it to localhost, using the local installation's default TCP port, or to the content of the BRLAPI_HOST environment variable, if it exists. Author Generated automatically by Doxygen for BrlAPI from the source code. Version 1.0 Mon Apr 1 2013 brlapi_connectionSettings_t(3)
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