shell腳本，如何寫進度條。

[root@localhost ~]# cat jindutiao.sh 
#!/bin/bash
#進度條
n=$((100/10))
N=$((100/20))
for i in `seq 500`

do 
    sleep 0.01
    [ $(($i%$n)) -eq 0 ] && echo -ne "\b=" && continue
    [ $(($i%$N)) -eq 0 ] && echo -ne "-"


done
echo ""


[root@localhost ~]# bash jindutiao.sh 
==================================================
[root@localhost ~]#