I am not sure why you are using eval. If I understand your issue, you want to get input from the user, set that to a few variables, and then use these variables as input to another program (in this case, adduser).

Why not try this:
print "Enter something:";
chomp($answer = <STDIN>);
$transfer_log = "$log_dir/$answer";
$adduser = `/usr/sbin/adduser -g $group -G $user ...`;

[download]
Anyway, I truncated a bit of the data, but I think you get the idea. You want to read in whatever your interested in. In order to run a program (i.e., adduser), use backticks or system().
Hope that helps,
Shendal

Update: As KM pointed out in chat, you'll probably want to enable taint checking (-T). That will warn you on unsafe constructs where you may be running something you don't want to.

In reply to Re: Configuration variables using run-time in put without -w complaints? by Shendal
in thread Configuration variables using run-time in put without -w complaints? by TQuid

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