don't attempt to export $COLUMNS
don't attempt to export $COLUMNS

First of all, it's not used by wp-cli (php-cli-tools calls tput
directly).

Second of all, $COLUMNS is a shell variable, so it wouldn't be available via
PHP's getenv() normally. In other words, calling tput directly is the
correct solution.

wp-cli/wp-cli,wp-cli/wp-cli