3 ms·

Could you explain how it works? I wonder what 0 0 19 7 * means.

by rak00n 9y ago

joyeuse6701 9y ago
This is a CRON Job and the notation indicates the time and frequency that an action should take place. https://en.wikipedia.org/wiki/Cron https://en.wikipedia.org/wiki/Cron
niklasrde 9y ago
Have a look at https://en.wikipedia.org/wiki/Cron#Overview https://en.wikipedia.org/wiki/Cron#Overview. In short: At 00:00 hours on 19/07 (i.e. July 19) execute that command. The * means 'regardless of what day of the week it is'.
- CRConrad 9y ago
  Regardless of what year, actually. So you're reminded of your friend's birthday every year, not just this one. [Edit:] What the... Nope, sorry, seems you're right and I'm wrong -- weekly it is. [/Edit]
deleted 9y ago
[deleted]
austincheney 9y ago
It is crontab.
oever 9y ago
it's a crontab file. '0 0 19 7 ' means 'midnight of July 19th, regardless () the weekday. It is example 2 from 'man crontab'.
nolok 9y ago
It's a unix/linux crontab, for repetitive task. See https://en.wikipedia.org/wiki/Cron https://en.wikipedia.org/wiki/Cron It's minute, hour, day of month, month, day of week In this case, repeat every 19th of july at midnight.
- karmelapple 9y ago
  This is why I like HN, and why it continues to be a much-higher-quality place to visit on the web than many other forums: there were no snarky replies, no "I can't believe you don't know cron" - just multiple friendly, helpful replies explaining exactly what this format is. What a good community.
  - tobych 9y ago
    Agreed, though my first reaction was definitely: "I can't believe you don't know cron". I had to step back a little and remember who the audience is. Then I wrote my comment (at the same time as everyone else here did).
  - HeavyStorm 9y ago
    Actually my first thought was - that guy was a smart-ass showing off. Of course many people wouldn't know a crontab line - Windows (and I guess Mac - never had one) don't have such magical tools.
    - laingc 9y ago
      Mac has cron. It's pretty standard on *NIX systems.
      - atmosx 9y ago
        Yeah but is superseded by launchd. So although it has cron, it's not running by default for many years.
tobych 9y ago
The file is a "cron schedule" [1]. Paste the series of numbers (and the *) into the box on the site below and you'll see it means "midnight on July 19th every year". The commenter will probably have this in their personal "crontab" file. They're emailing themselves every year on that date. [1] https://crontab.guru/ https://crontab.guru/

Could you explain how it works? I wonder what 0 0 19 7 * means.

by rak00n 9y ago

Could you explain how it works? I wonder what 0 0 19 7 * means.

This is a CRON Job and the notation indicates the time and frequency that an action should take place. https://en.wikipedia.org/wiki/Cron https://en.wikipedia.org/wiki/Cron

niklasrde 9y ago

Have a look at https://en.wikipedia.org/wiki/Cron#Overview https://en.wikipedia.org/wiki/Cron#Overview. In short: At 00:00 hours on 19/07 (i.e. July 19) execute that command. The * means 'regardless of what day of the week it is'.

CRConrad 9y ago
Regardless of what year, actually. So you're reminded of your friend's birthday every year, not just this one. [Edit:] What the... Nope, sorry, seems you're right and I'm wrong -- weekly it is. [/Edit]

deleted 9y ago

[deleted]

austincheney 9y ago

It is crontab.

oever 9y ago

it's a crontab file. '0 0 19 7 ' means 'midnight of July 19th, regardless () the weekday. It is example 2 from 'man crontab'.

nolok 9y ago

It's a unix/linux crontab, for repetitive task. See https://en.wikipedia.org/wiki/Cron https://en.wikipedia.org/wiki/Cron It's minute, hour, day of month, month, day of week In this case, repeat every 19th of july at midnight.

karmelapple 9y ago
This is why I like HN, and why it continues to be a much-higher-quality place to visit on the web than many other forums: there were no snarky replies, no "I can't believe you don't know cron" - just multiple friendly, helpful replies explaining exactly what this format is. What a good community.
- tobych 9y ago
  Agreed, though my first reaction was definitely: "I can't believe you don't know cron". I had to step back a little and remember who the audience is. Then I wrote my comment (at the same time as everyone else here did).
- HeavyStorm 9y ago
  Actually my first thought was - that guy was a smart-ass showing off. Of course many people wouldn't know a crontab line - Windows (and I guess Mac - never had one) don't have such magical tools.
  - laingc 9y ago
    Mac has cron. It's pretty standard on *NIX systems.
    - atmosx 9y ago
      Yeah but is superseded by launchd. So although it has cron, it's not running by default for many years.

tobych 9y ago

The file is a "cron schedule" [1]. Paste the series of numbers (and the *) into the box on the site below and you'll see it means "midnight on July 19th every year". The commenter will probably have this in their personal "crontab" file. They're emailing themselves every year on that date. [1] https://crontab.guru/ https://crontab.guru/