1.2 KiB
1.2 KiB
User Management
| Command | Description |
| sudo adduser <user> | Create a new user |
| sudo userdel <user> | Delete a user |
| sudo usermod -aG <group> <user> | Add a user to group |
| sudo deluser <user> <group> | Remove a user from a group |
CRON
| Field | Allowed Values | Description |
| Second | 0 - 59 | Trigger every SECOND second(s) |
| Minute | 0 - 59 | Trigger every MINUTE minute(s) |
| Hour | 0 -23 | Trigger every HOUR hour(s) |
| Day | 1 - 31 | Trigger every DAY day(s) of month |
| Month | 1 - 12 | Trigger every MONTH month(s) |
| Doay of Week | 0 - 6 | MON-SUN Trigger on specific DAY OF WEEK |
Special Characters
| Special Character | Description |
| * | Trigger on tick of every time unit |
| , | List separator |
| - | Specifies a range |
| / | Defines an increment |
Examples
| Cron Expression | Description |
| 0 * * * * | Executes every minute |
| 0 0 * * * * | Executes every hour |
| 0 0 0 * * * | Executes every day |
| 0 0 0 0 * * | Executes every month |
| 0 0 0 1 1 * | Executes on first day of Jan each year |
| 30 20 * * SAT | Executes at 08:30pm every Saturday |
| 30 20 * * 6 | Executes at 08:30pm every Saturday |
| 0 */5 * * * * | Executes every five minutes |
| 0 0 8-10/1 * * * | Executes every hour between 8am and 10am |