I believe 'rlwrap' is widely used for adding 'sqlplus' the history function and command line editing.
'rlwrap' has other functions and here's my kludgy alias to force sqlplus to use the full real estate of your
tty. Be it PuTTy session from Windows or Linux gnome terminal.

$ declare -f sqlplus
sqlplus ()
{
    PRE_TEXT=$(resize |sed -n "1s/COLUMNS=/set linesize /p;2s/LINES=/set pagesize /p"|while read line; do printf "%s \ " "$line";done);
    if [ -z "$1" ]; then
        rlwrap -m -P "$PRE_TEXT" sqlplus /nolog;
    else
        if ! echo $1 | grep '^-' > /dev/null; then
            rlwrap -m -P "$PRE_TEXT connect $*" sqlplus /nolog;
        else
            command sqlplus $*;
        fi;
    fi
}