This section will assist you in making telnet to a Unix system work properly. You need to do this so that full-screen programs such as vi know the size of your telnet window. This section should help solve problems and errors such as the following:
If you get errors similar to the above, or if vi is not redrawing the screen correctly, read on...
On Windows 95
After you start telnet and before you type in your login userid and password to the remote Unix system, make sure your telnet session is configured correctly. Here are the things you must verify in telnet on your Windows machine:
Menu: Terminal | Preferences
Anything marked "your choice" does not have to be changed. You only need to set these options once and they will be remembered.
Menu: Connect | Remote System ...
If you use the telnet Connect/RemoteSystem dialog box, make sure you use the following settings:
Note that vt100 is spelled with lower-case letters and no blanks. The number is one hundred.
You only need to type in the short name acadaix if you are in an Algonquin College Lab or using a College dial-in phone line. Use the full Internet address if you are anywhere else. (Yes, you can telnet to this Unix machine from anywhere in the world, even your from home or work.)
On the Unix side of your connection, you have to make sure of only two things:
Setting the correct number of lines
Once you are connected to Unix and have logged in, you need to ensure that Unix knows the size of the telnet terminal window you are using. If your Windows telnet Buffer Size (in the Terminal|Preferences menu) is set to 24, you may not need to do this (but it won't hurt). If your Windows telnet Buffer Size is not 24, you will need to do the command below every time you connect to Unix. (Once you learn how to create a .profile file, you can put these commands into that file for auomatic execution every time you log in.)
Use the Unix resize command on Unix to make Unix know the size of your telnet window (the window size is the Windows telnet Buffer Size in the Terminal|Preferences menu). If just typing resize at the Unix prompt doesn't work (if you get "not found"), you'll have to type the full Unix pathname of the resize command: /usr/bin/X11/resize
Use either of the above Unix command lines. Note the upper-case letter X in the full pathname, and remember to use forward slashes and not backslashes. What you should see as output after you type the command into Unix is something similar to the following:
$ /usr/bin/X11/resize COLUMNS=80; LINES=24; export COLUMNS LINES;
If you do not see this output, check your typing, then consult a lab monitor or instructor.
To use successfully full-screen commands such as vi on Unix, the number of LINES shown in the output of resize must match the Buffer Size given in the Terminal|Preferences menu of your Windows telnet session. Make sure that the number of lines is not bigger than your screen! 24 lines is always safe; sometimes you can use 30 or even 50 if you have a big monitor (or are using small Courier fonts). Start with a telnet Buffer Size of 24.
Setting a recognized Terminal type
When starting the vi text editor, you may see something like the following:
The above errors mean that the terminal type set by telnet for your login session is not recognized on Unix as valid. Do not attempt to use vi or any other full-screen command if you are getting the above errors. Full-screen commands need to know what kind of terminal you are using, to be able to draw on your screen correctly. Fix your terminal type, first.
If you are using a Windows telnet command to connect to Unix, and you get the above errors, you can work around the problem by telling Unix that your terminal type is a vt100. Here's how you can do this at a shell prompt:
$ TERM=vt100 $ export TERMThe case of the letters is significant. TERM is upper-case; vt100 is lower-case. If you always connect to Unix using a vt100-compatible terminal emulator (such as Windows telnet), you can put the above two lines into your .profile file for automatic execution every time you log in.
Web Author: Ian! D. Allen firstname.lastname@example.org