Shell script that is similar to `watch -c`, but output is cleared.

watchit.sh

#!/bin/sh
HOME=$(tput cup 0 0)
ED=$(tput ed)
EL=$(tput el)
printf '%s%s' "$HOME" "$ED"
while true
do
    ROWS=$(tput lines)
    COLS=$(tput cols)
    CMD="$@"
    ${SHELL:=sh} -c "$CMD" | head -n $ROWS | while IFS= read LINE; do
        printf '%-*.*s%s\n' $COLS $COLS "$LINE" "$EL"
    done
    printf '%s%s' "$ED" "$HOME"
    sleep 1
done