setenv TERM vt100
or in your:
TERM=vt100; export TERM
But if, like many UNIX users, you might log in from time to time at different terminals, from home, or on different systems over a network, you need some more intelligent method for setting the terminal type.
If noare specified and TERM is already set, tset uses the value of TERM to determine the terminal type.
If no arguments are specified and TERM is not set, then tset uses the value specified in the system file /etc/ttytype or /etc/ttys (BSD 4.3 and derivatives only).
If a terminal type is specified as an argument, that argument is used as the terminal type, regardless of the value of TERM.
The -m (map) option allows a fine degree of control in cases where the terminal type may be ambiguous. For example, if you sometimes log in on a dialup line, sometimes over a local area network, and sometimes on a hardwired line, the -m option can be specified to determine which login is currently being used, and the terminal type can be set accordingly.
TERM=`tset - -Q
options`; export TERM
(Given the - option, tset prints the value that it determines for the terminal type to The -Q (quiet) option causes tset to suppress printing of a message it normally prints regarding the values to which it has set the erase and kill characters - a job it does in its alternate role as terminal initializer. The surrounding the tset command cause its output to be interpolated into the command line.). Otherwise, it , but keeps the terminal type to itself.
In the C shell, you should use the
command to capture the output of tset; this will also allow you
(You must also issue the command
as explained in article
To see what tset can do, consider a case where the terminal's serial line is connected to a dialup modem, through which several different users might be connected, each using a different type of terminal. Accordingly, the default terminal type in /etc/ttytype should be set to dialup. The tset command could then be used in the .login file as follows, with the appropriate terminal type set for each user:
set noglob eval `tset -s -Q -m 'dialup:vt100'`
This means that if ttytype says dialup, use vt100 as the terminal type. A colon separates the ttytype value and the value to which it is to be mapped. If a user wants to be prompted to be sure, place a question mark after the colon and before the mapped terminal type:
set noglob eval `tset -s -Q -m 'dialup:?vt100'`
The prompt will look like this:
TERM = (vt100)
If the user presses RETURN, the preferred terminal type will be used. Alternatively, another terminal type could be entered at that time.
You can cause tset to prompt for a terminal type even without testing a generic entry like dialup. Just specify the desired terminal type, preceded by a question mark, after the -m option. For example:
set noglob eval `tset -s -Q -m '?vt100'`
It is also possible to specify different terminal types for different line speeds. Say, for example, that you normally used a Wyse-50 with a 9600-bps modem when dialing in from home, but used a portable PC with a VT100 terminal emulator and 2400-bps modem when you were on the road. You might then use a tset command like this:
set noglob eval `tset -s -Q -m 'dialup@2400:vt100' wy50`
Assuming that the type is set in ttytype as dialup, tset will use the type vt100 if at 2400 bps and, if not, will use the type wy50.
[Watch out for the linespeed switches. They don't work on a lot of networked systems - usually, the line speed at the computer's port is higher than the speed at the terminal. The same problem occurs, these days, with dialup modems that use data compression. -JP ] Various symbols can be used for line-speed calculations:
Means less than the specified speed.
Means greater than the specified speed.
Multiple -m options can be specified; the first map to be satisfied will be used. If no match is found, a final value specified on the line without a -m option (as in the above example) will be used. If no value is specified, the type in /etc/ttytype will be used.
- from O'Reilly & Associates' termcap & terminfo, Chapter 4