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ETI programs count on certain information being in a user's environment to run properly. Specifically, users of a ETI program should usually include the following three lines in their .profile files:
TERM=current terminal type export TERM tput init
For an explanation of these lines, turn again to ``The ETI/terminfo connection''. Users of an ETI program could also define the environment variables $LINES, $COLUMNS, and $TERMINFO in their .profile files. However, unlike $TERM, these variables do not have to be defined.