[완료]쉘스크립트로 작성 progress를 표현하려고 하는데 도와주세요.

#!/bin/sh
 
function hide_cursor() {
    echo -n `tput civis`
}
 
function show_cursor() {
    echo -n `tput cvvis`
}
 
function progress () {
    # Display a progress bar
    # usage: progress percentage
    #
    # PERCENTAGE should be in range between 0 and 100.
    # If PERCENTAGE is 100, this function returns 1, otherwise returns zero.
    echo -en "\r["
 
    inc=$1
    if test $inc -gt 100; then
        inc=100;
    fi
 
    num=`expr 40 \* "$inc" / 100`
    i=0
    while test $i -le $num; do
        echo -n "="
        i=`expr $i + 1`
    done
 
    while test $i -le 40; do
        echo -n " "
        i=`expr $i + 1`
    done
 
    echo -n "] $inc%"
 
    if test $inc -ge 100; then
        return 1
    else
        return 0
    fi
}
 
 
incr=0
hide_cursor
trap 'show_cursor; echo ""; exit 1' INT QUIT TERM EXIT
 
while progress $incr; do
    incr=`expr $incr + 10`
    sleep 1
done
 
echo ""
show_cursor