问Unix日期程序，嵌套的if语句表示现在是什么时间，echo是一行取决于时间的语句

EN

#!/bin/sh
# A daily reminder service
set `date`
echo "Remember for today:"
if [ $1 == "Sat" ] | [ $1 == 'Sun' ]
then
    echo "it is the weekend"
else
    if [ "5:55:00" < $4 < "6:05:59" ] 
    then 
        echo "get up"
    elif [ "6:55:00" < $4 < "7:05:59" ] 
    then
        echo "have breakfast"
    elif [ "7:55:00" < $4 < "8:05:59" ] 
    then
        echo "start the first class"
    elif [ "21:55:00" < $4 < "22:05:59" ] 
    then
        echo "time to do homework"
    else
        echo "There's nothing for you to do!"
    fi
fi

[cpm1051@srvlp-dpt-cs01 labfifteen]$ ./dailyReminder
Remember for today:
./dailyReminder: line 9: 10:29:33: No such file or directory
./dailyReminder: line 12: 10:29:33: No such file or directory
./dailyReminder: line 15: 10:29:33: No such file or directory
./dailyReminder: line 18: 10:29:33: No such file or directory
There's nothing for you to do!