Cron

Apparently you can schedule a file to run with cron command natively in bash :0

0 wget -O - -q -t 1 http://CRON_URL

# +---------------- minute (0 - 59)
# |  +------------- hour (0 - 23)
# |  |  +---------- day of month (1 - 31)
# |  |  |  +------- month (1 - 12)
# |  |  |  |  +---- day of week (0 - 6) (Sunday=0)
# |  |  |  |  |
  *  *  *  *  *  command to be executed

If you computer is off when it was supposed to be run, doesn't run it

anacrontab apparently can run these jobs after the fact

Other cron syntax

*    *    *    *    *    *
┬    ┬    ┬    ┬    ┬    ┬
│    │    │    │    │    │
│    │    │    │    │    └ day of week (0-7)(0/7 = Sun)
│    │    │    │    └───── month (1 - 12)
│    │    │    └────────── day of month (1 - 31)
│    │    └─────────────── hour (0 - 23)
│    └──────────────────── minute (0 - 59)
└───────────────────────── second (0 - 59, OPTIONAL)

Operator	Purpose	Example
asterisk ( * )	Specifies all possible values for a field	An asterisk in the hour time field is equivalent to “every hour.”
question mark (?)	A question mark ( ? ) is allowed in the day-of-month and day-of-week fields. It is used to specify “no specific value,” which is useful when you need to specify something in one of these two fields, but not in the other.	If you want a trigger to fire on a particular day of the month (for example, the 10th), but you don't care what day of the week that is, enter 10 in the day-of-month field, and ? in the day-of-week field.
dash ( - )	Specifies a range of values	2-5, which is equivalent to 2,3,4,5
comma ( , )	Specifies a list of values	1,3,4,7,8
slash ( / )	Used to skip a given number of values	/3 in the hour time field is equivalent to 0,3,6,9,12,15,18,21. The asterisk ( ) specifies “every hour,” but the /3 means only the first, fourth, seventh.You can use a number in front of the slash to set the initial value. For example, 2/3 means 2,5,8,11, and so on.
L (“last”)	The L character is allowed for the day-of-month and day-of-week fields.Specifies either the last day of the month, or the last xxx day of the month.	The value L in the day-of-month field means “the last day of the month,” which is day 31 for January, or day 28 for February in non-leap years. If you use L in the day-of-week field by itself, it simply means 7 or SAT. But if you use it in the day-of-week field after another value, it means “the last xxx day of the month.” For example, 6L means “the last Friday of the month.”HINT:When you use the L option, be careful not to specify lists or ranges of values. Doing so causes confusing results.
W (“weekday”)	The W character is allowed for the day-of-month field.Specifies the weekday (Monday-Friday) nearest the given day.	If you specify 15W as the value for the day-of-month field, the meaning is “the nearest weekday to the 15th of the month.” So if the 15th is a Saturday, the trigger fires on Friday the 14th. If the 15th is a Sunday, the trigger fires on Monday the 16th. If the 15th is a Tuesday, it fires on Tuesday the 15th. However, if you specify 1W as the value for day-of-month, and the 1st is a Saturday, the trigger fires on Monday the 3rd, because it does not “jump” over the boundary of a month’s days. The W character can only be specified when the day-of-month is a single day, not a range or list of days.HINT:You can combine the L and W characters for the day-of-month expression to yield LW, which translates to “last weekday of the month.”
pound sign ( # )	The pound sign ( # ) character is allowed for the day-of-week field. This character is used to specify “the nth” xxx day of the month.	The value of 6#3 in the day-of-week field means the third Friday of the month (day 6 = Friday and #3 = the 3rd one in the month).Other Examples: 2#1 specifies the first Monday of the month and 4#5 specifies the fifth Wednesday of the month. However, if you specify #5 and there are fewer than 5 of the given day-of-week in the month, no firing occurs that month.