On Sun, 09 Sep 2007 07:24:44 +0000, usenet wrote:
> On Sep 8, 4:52 pm, [EMAIL PROTECTED] wrote:
>> How would I make a script that gets a list of all the computer names
>> and ip addresses, internal 192.168..., of the computers attached to my
>> wired network? Or is there a program that will do this already? Thanks
>
> There is already such a program: who
Which who program is that? The one I'm familiar with only looks at
logged-in users, not network scans:
NAME
who - show who is logged on
SYNOPSIS
who [OPTION]... [ FILE | ARG1 ARG2 ]
DESCRIPTION
-a, --all
same as -b -d --login -p -r -t -T -u
-b, --boot
time of last system boot
-d, --dead
print dead processes
-H, --heading
print line of column headings
-l, --login
print system login processes
--lookup
attempt to canonicalize hostnames via DNS
-m only hostname and user associated with stdin
-p, --process
print active processes spawned by init
-q, --count
all login names and number of users logged on
-r, --runlevel
print current runlevel
-s, --short
print only name, line, and time (default)
-t, --time
print last system clock change
-T, -w, --mesg
add user's message status as +, - or ?
-u, --users
list users logged in
You can see which hosts have active connections to this one with netstat,
but it can include hosts outside the LAN. You can see recent connections
to or from the LAN in the arp cache. You can exhaustively ping every
possible address, although they are not obliged to respond. Otherwise, if
you're using DHCP, you can ask the DHCP server for a list of current
leases.
> You may need to do an nsloopup on the hostnames to get the IP address,
> depending on your environment.
Ahem. nslookup. But trivially implemented in Perl via the
gethostbyname/gethostbyaddr functions.
--
Peter Scott
http://www.perlmedic.com/
http://www.perldebugged.com/
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