套件：snooze（0.5-1 以及其他的）

run a command at a particular time

`snooze` is a tool for waiting until a particular time and then running a command. Together with a service supervision system such as runit, this can be used to replace cron(8).

Benefits over cron:

 - mnemonic syntax
 - no overlapping job runs possible
 - filtering by ISO week and day of year
 - due to supervision, no centralized daemon required
 - due to supervision, can easily disable jobs or force their
   execution instantly
 - due to supervision, have custom logs
 - due to no centralized daemon, no fuzzing with multiple users/permissions
 - very robust with respect to external time changes
 - can use a file timestamp to ensure minimum waiting time between two
   runs, even across reboots
 - randomized delays (some cron have that)
 - variable slack (no need for anacron)
 - ad-hoc usage possible, just run the program from command line

Benefits over runwhen:

 - less confusing usage (arguably)
 - filtering by ISO week and day of year
 - zero dependencies

Benefits over uschedule:

 - no centralized daemon required
 - filtering by ISO week and day of year

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