Bash进度条

#!/bin/bash
#   Slick Progress Bar
#   Created by: Ian Brown (ijbrown@hotmail.com)
#   Please share with me your modifications
# Note: From http://stackoverflow.com/questions/11592583/bash-progress-bar
# Functions
PUT(){ echo -en "\033[${1};${2}H";}  
DRAW(){ echo -en "\033%";echo -en "\033(0";}         
WRITE(){ echo -en "\033(B";}  
HIDECURSOR(){ echo -en "\033[?25l";} 
NORM(){ echo -en "\033[?12l\033[?25h";}
function showBar {
        percDone=$(echo 'scale=2;'$1/$2*100 | bc)
        halfDone=$(echo $percDone/2 | bc) #I prefer a half sized bar graph
        barLen=$(echo ${percDone%'.00'})
        halfDone=`expr $halfDone + 6`
        tput bold
        PUT 7 28; printf "%4.4s  " $barLen%     #Print the percentage
        PUT 5 $halfDone;  echo -e "\033[7m \033[0m" #Draw the bar
        tput sgr0
        }
# Start Script
clear
HIDECURSOR
echo -e ""                                           
echo -e ""                                          
DRAW    #magic starts here - must use caps in draw mode                                              
echo -e "          PLEASE WAIT WHILE SCRIPT IS IN PROGRESS"
echo -e "    lqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk"  
echo -e "    x                                                   x" 
echo -e "    mqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqj"
WRITE             
#
# Insert your script here
for (( i=0; i<=50; i++ ))  
do
    showBar $i 50  #Call bar drawing function "showBar"
    sleep .2
done
# End of your script
# Clean up at end of script
PUT 10 12                                           
echo -e ""                                        
NORM