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Full Discussion: Bash script for checking if a host is on the local network
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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LEARN ABOUT ULTRIX

ruptime

ruptime(1c)															       ruptime(1c)

Name
       ruptime - show host status of local machines

Syntax
       ruptime [ options ] [ machinename ]

Description
       The  command  gives  a  status  line  like  for each machine on the local network.  If a machinename is given, the status of only the named
       machine is given.  These status lines are formed from packets broadcast by each host on the network once a minute.

       Machines for which no status report has been received for 5 minutes are shown as being down.

Options
       -a   Users idle an hour or more are not counted unless this option is specified.

       -d   Display only those hosts that are considered down.

       -l   Sort the status list by load average.  If more than one sort option is given, uses the last one.

       -r   Show only hosts that are up and running.

       -t   Sort the status list by uptime.  If more than one sort option is given, uses the last one.

       -u   Sort the status list by number of users.  If more than one sort option is given, uses the last one.

       -nn  Show only those hosts with nn or more users.

Restrictions
       Because the daemon sends its information in broadcast packets it generates a large amount of network traffic.  On large networks the  extra
       traffic	may  be  objectionable.   Therefore,  the  daemon is disabled by default.  To make use of the daemon for both the local and remote
       hosts, remove the comment symbols (#) from in front of the lines specifying in the file.

       If the daemon is not running on a remote machine, the machine may incorrectly appear to be down when you use the command to  determine  its
       status.	See the reference page for more information.

       If  a  system  has  more  than 40 users logged in at once, the number of users displayed by the command is incorrect.  Users who login to a
       machine after that point fail to increment the user count that appears in the output of the command.  This is due to the maximum size limit
       of an Ethernet packet, which is 1500 bytes, and the fact that the daemon must broadcast its information in a single packet.

Files
       /usr/spool/rwho/whod.*	Information about other machines

See Also
       rwho(1c), rwhod(8c)

																       ruptime(1c)
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