Write a command line application or script which parses a cron string and expands each field to show the times at which it will run. You may use whichever language you feel most comfortable with. You should only consider the standard cron format with five time fields (minute, hour, day of month, month, and day of week) plus a command,
Write a command line application or script which parses a cron string and expands each field to show the times at which it will run. You may use whichever language you feel most comfortable with. You should only consider the standard cron format with five time fields (minute, hour, day of month, month, and day of week) plus a command, and you do not need to handle the special time strings such as "@yearly". The input will be on a single line. The cron string will be passed to your application as a single argument.
~$ your-program ＂*/15 0 1,15 * 1-5 /usr/bin/find＂The output should be formatted as a table with the field name taking the first 14 columns and the times as a space-separated list following it.
For example, the following input argument:
*/15 0 1,15 * 1-5 /usr/bin/findShould yield the following output:
minute 0 15 30 45
hour 0
day of month 1 15
month 1 2 3 4 5 6 7 8 9 10 11 12
day of week 1 2 3 4 5
command /usr/bin/find
Cron format supports multiple input types :
- 5 : a fixed value
- 5-10 : a range
- */5 : a frequency
- 5,7 : a list of values
Note: Please email your completed project as a zipped attachment to careers@vertex.kg with subject line “Technical task - Your name”. You should spend no more than three hours on this exercise. If you do not have time to handle all possible cron strings then an app which handles a subset of them correctly is better than one which does not run or produces incorrect results.
You should see your project reviewer as a new team member you are handing the project over to. Provide everything you feel would be relevant for them to ramp up quickly, such as unit/acceptance tests, a README and instructions for how to run your project in a clean macOS/Linux environment.
Before you begin, ensure you have met the following requirements:
- You have a working Python 3+ installation on your machine.
If Python is not installed, you can download it from the official Python website:
You can check your Python version by opening a terminal and running the following command:
python --version- Clone the repository and navigate to the project folder:
git clone https://github.com/joerude/cron-expression-parser.git
cd cron-expression-parser- Run the Application:
python main.py "<cron_expression>"Example:
python main.py "*/15 0 1,15 * 1-5 /usr/bin/find"Output example:
minute 0 15 30 45
hour 0
day of month 1 15
month 1 2 3 4 5 6 7 8 9 10 11 12
day of week 1 2 3 4 5
command /usr/bin/find
python tests.py