上面的shell可以做到这一点，你甚至可以将它们转换为别名(你可能需要包装一个函数来处理参数):

alias myWatch='_() { while :; do clear; $2; sleep $1; done }; _'

例子:

myWatch 1 ls ## Self-explanatory
myWatch 5 "ls -lF $HOME" ## Every 5 seconds, list out home directory; double-quotes around command to keep its arguments together

Homebrew也可以从http://procps.sourceforge.net/:上安装手表

brew install watch

使用MacPorts:

$ sudo port install watch

试试这个:

#!/bin/bash
# usage: watch [-n integer] COMMAND

case $# in
    0)
        echo "Usage $0 [-n int] COMMAND"
        ;;
    *)      
        sleep=2;
        ;;
esac    

if [ "$1" == "-n" ]; then
    sleep=$2
    shift; shift
fi


while :; 
    do 
    clear; 
    echo "$(date) every ${sleep}s $@"; echo 
    $@; 
    sleep $sleep; 
done

上面的shell可以做到这一点，你甚至可以将它们转换为别名(你可能需要包装一个函数来处理参数):

alias myWatch='_() { while :; do clear; $2; sleep $1; done }; _'

例子:

myWatch 1 ls ## Self-explanatory
myWatch 5 "ls -lF $HOME" ## Every 5 seconds, list out home directory; double-quotes around command to keep its arguments together

Homebrew也可以从http://procps.sourceforge.net/:上安装手表

brew install watch

或者，在你的~/。bashrc文件:(

function watch {
    while :; do clear; date; echo; $@; sleep 2; done
}

当你的主命令需要相当长的时间才能完成时，为了防止闪烁，你可以捕获输出，并只在它完成时清除屏幕。

function watch {while :; do a=$($@); clear; echo "$(date)\n\n$a"; sleep 1;  done}

然后用它:

watch istats