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Re: [TCLUG:10172] Perl newbie - starting a telnet process...
I doug around and found this in an email bag:
===========
From: daily_perl@yoak.com
Subject: Daily Perl FAQ - How can I write expect in Perl?
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Question:
How can I write expect in Perl?
Once upon a time, there was a library called chat2.pl (part of the
standard perl distribution), which never really got finished. If
you find it somewhere, *don't use it*. These days, your best bet is
to look at the Expect module available from CPAN, which also
requires two other modules from CPAN, IO::Pty and IO::Stty.
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When I first began the Perl FAQ in the late 80s, I never realized it
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AUTHOR AND COPYRIGHT INFORMATION
Copyright (c) 1997 Tom Christiansen and Nathan Torkington. All rights
reserved.
===========
Clay Fandre wrote:
>
> Troy Johnson wrote:
> >
> > Is there an expect perl package on CPAN somewhere?
>
> As far as I know there isn't such a package. (yet). Expect is TCL based
> and very different that perl. What I have done in the past is to call
> small expect scripts from my 'main' perl scripts. I get the best of both
> worlds.
>
> >
> > Clay Fandre wrote:
> > >
> > > I would recommend using expect. It is easier to use (in this particular
> > > case) and is much nicer about timeouts and stuff like that. It also
> > > comes with autoexpect, which automatically creates an expect script for
> > > you. Very nice.
> > >
> > > As far as your perl script goes, you are grabbing the output of the
> > > telnet command instead of inputting to it. To input, the pipe goes after
> > > the command:
> > > open( TELNETPROC, "telnet|") || die "Unable to open telnet $!\n";
> > >
> > > (do a perldoc -f open for more info)
> > >
> > > open only allows for one way or the other. (Input or output.) That's why
> > > I recommend expect. If you really need to use perl, look at open2, which
> > > allows for 2-way communication to your process. (I'm not sure if it is
> > > installed by default. Might have to install it from CPAN.)
> > >
> > > Mike Glaser wrote:
> > > >
> > > > I was trying to write a Perl script today that would telnet into a
> > > > router, issue a few commands and then close. I wasn't having any
> > > > luck. Can anyone tell me how to go about doing it?? Here are the
> > > > particulars...
> > > >
> > > > 1) telnet
> > > > 2) open xxx.xxx.xxx.xxx
> > > > 3) enter_password
> > > > 4) command
> > > > 5) exit
> > > >
> > > > Here is what my script was looking like...
> > > >
> > > > #!/usr/bin/perl
> > > > open( TELNETPROC, "|telnet");
> > > > print TELNETPROC "open 192.168.0.1\n";
> > > > print TELNETPROC "thesecretpassword\n";
> > > > print TELNETPROC "clear line 1\n";
> > > > print TELNETPROC "exit\n";
> > > > close FTPPROC;
> > > >
> > > > What may I be missing here?? I have the O'Reilly book 'Learing Perl'
> > > > to help me get started with Perl, but I have not been able to pick up
> > > > much yet.
> > > >
> > > > Thanks,
> > > > Mike Glaser
> > > >
> > > > ---------------------------------------------------------------------
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> > >
> > > --
> > > Clay Fandre
> > > cfandre@maddog.mn-linux.org
> > > Twin Cities Linux Users Group
> > > http://www.mn-linux.org
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: tclug-list-unsubscribe@mn-linux.org
> > > For additional commands, e-mail: tclug-list-help@mn-linux.org
> >
> > ---------------------------------------------------------------------
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>
> --
> Clay Fandre
> cfandre@maddog.mn-linux.org
> Twin Cities Linux Users Group
> http://www.mn-linux.org
>
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