cp显示进度条

#!/bin/bash
trap ‘exit_fun‘ 2

usage(){
        echo "Usage: `basename $0` \"src file\" \"dst file\""
        exit 1
}

exit_fun(){
        echo -e "\033[?25h"
        kill -9 $(ps -ef|awk ‘/ [c]p /{print $2}‘) &>/dev/null
        exit 1
}


[ "$#" -ne "2" ] && usage
[ -d "$2" ] && k=${2%%/}/`basename $1` || k=$2

fromsize=`ls -s $1|cut -d" " -f1`
cp $1 $k &
start=`date +%s`
sleep 0.2
echo -ne "\033[?25l"
while :;do
        tosize=`ls -s $k|cut -d" " -f1`
        x=`echo "$tosize $fromsize"|awk ‘{print int($1*100/$2)}‘`
        [ $x -eq 99 ] && x=100
        echo -n "["
        for((i=0;i<x;i=$i+2));do echo -n "=";done
        echo -n ">"
        for((j=i;j<=99;j=$j+2));do echo -n " ";done
        now=$[`date +%s` - $start]
        [ $now -eq 0 ] && now=1
        avg=$[$tosize/$now/1024]
        printf "] %4s%% %4sM/s" $i $avg
        [ $x -ge 100 ] && break
        sleep 0.1
        echo -ne "\r"
done
echo -e "\033[?25h"