cp显示进度条 —纯shell实现方法

写创建一个shell脚本文件:vim cp.sh

文件中的内容：

#!/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"