repeat.sh. como tail-f, mas para comandos

#!/bin/bash
# usage: ./repeat.sh <command> [frequency in seconds]
# control+c to quit

COMMAND=$1              # command is first arg
FREQUENCY=${2:-1}       # frequency is second arg or "1"

clear

trap ctrl_c INT         # catch ctrl+c keypress
function ctrl_c
{
    clear
    tput cnorm          # put the cursor back to normal
    exit
}

while [ true ]
do

    tput civis          # hide the cursor
    tput cup 0 0        # put cursor at top-left
    $COMMAND            # execute the command
    sleep $FREQUENCY    # wait for frequency

done

https://gist.github.com/deanrather/5660422