cron.md

   1 ---
   2 title: Cron
   3 category: CLI
   4 layout: 2017/sheet
   5 updated: 2018-05-03
   6 weight: -3
   7 ---
   8
   9 ## Format
  10 {: .-two-column}
  11
  12 ### Format
  13
  14 ```
  15 Min  Hour Day  Mon  Weekday
  16 ```
  17 {: .-setup}
  18
  19 ```
  20 *    *    *    *    *  command to be executed
  21 ```
  22
  23 ```
  24 ┬    ┬    ┬    ┬    ┬
  25 │    │    │    │    └─  Weekday  (0=Sun .. 6=Sat)
  26 │    │    │    └──────  Month    (1..12)
  27 │    │    └───────────  Day      (1..31)
  28 │    └────────────────  Hour     (0..23)
  29 └─────────────────────  Minute   (0..59)
  30 ```
  31 {: .-setup.-box-chars}
  32
  33 ### Examples
  34
  35 | Example        | Description           |
  36 | ---            | ---                   |
  37 | `0 * * * *`    | every hour            |
  38 | `*/15 * * * *` | every 15 mins         |
  39 | `0 */2 * * *`  | every 2 hours         |
  40 | `0 0 * * 0`    | every Sunday midnight |
  41 | ---            | ---                   |
  42 | `@reboot`      | every reboot          |
  43
  44 ### Crontab
  45
  46 ```bash
  47 # Adding tasks easily
  48 echo "@reboot echo hi" | crontab
  49 ```
  50
  51 ```bash
  52 # Open in editor
  53 crontab -e
  54 ```
  55
  56 ```bash
  57 # List tasks
  58 crontab -l [-u user]
  59 ```