进度指示器

INTERVAL=1
TCOUNT="0"
while :
do
        TCOUNT=`expr $TCOUNT + 1`
        case $TCOUNT in
                "1") echo -e '-'"\b\c"
                        sleep $INTERVAL
                        ;;
                "2")echo -e '\\'"\b\c"
                        sleep $INTERVAL
                        ;;
                "3")echo -e "|\b\c"
                        sleep $INTERVAL
                        ;;
                "4")echo -e "/\b\c"
                        sleep $INTERVAL
                        ;;
                *)  TCOUNT="0" ;;
        esac
done

[root@localhost ~]# SECONDS=0
#中间停顿了12秒
[root@localhost ~]# echo $SECONDS
12