05-22-2019
Without knowing what operating system(s) those thousand machines are running and what the naming conventions on each of those thousand machines is for user's home directories, there isn't much chance that we can help you with a request like this. Knowing what shell you'll be using on the machine where you are running this script and on each of the thousand machines you'll be querying could also make a bg difference.
And, of course, this assumes that the directory named .ssh in each user's home directory is owned by that user (and not by root). One might also want to know if any user names on those thousand machines contains the string id.
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friends
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rwho(1) User Commands rwho(1)
NAME
rwho - who is logged in on local machines
SYNOPSIS
rwho [-a]
DESCRIPTION
The rwho command produces output similar to who(1), but for all machines on your network. If no report has been received from a machine
for 5 minutes, rwho assumes the machine is down, and does not report users last known to be logged into that machine.
If a user has not typed to the system for a minute or more, rwho reports this idle time. If a user has not typed to the system for an hour
or more, the user is omitted from the output of rwho unless the -a flag is given.
OPTIONS
-a Report all users whether or not they have typed to the system in the past hour.
FILES
/var/spool/rwho/whod.* information about other machines
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWrcmds |
+-----------------------------+-----------------------------+
SEE ALSO
finger(1), ruptime(1), who(1), in.rwhod(1M), attributes(5)
NOTES
rwho does not work through gateways.
The directory /var/spool/rwho must exist on the host from which rwho is run.
This service takes up progressively more network bandwith as the number of hosts on the local net increases. For large networks, the cost
becomes prohibitive.
The rwho service daemon, in.rwhod(1M), must be enabled for this command to return useful results.
SunOS 5.10 6 Nov 2000 rwho(1)