Cron Parser

A command line application to parse cron expressions and display the results in a table. It will, for example, take the following string:

*/15 0 1-21 * 1-5 /usr/bin/find

And spit out a table which breaks down the cron expression into its composite parts:

minute: 0 15 30 45
hour: 0
dayOfMonth: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
month: 1 2 3 4 5 6 7 8 9 10 11 12
dayOfWeek: 1 2 3 4 5
command: /usr/bin/find

Getting Started

Install homebrew first.

Install java, sbt and scala with brew.

brew cask install java 
brew install sbt
brew install scala

After cloning the project, start the sbt console in the root directory of the project. Package the project with package, copy the jar out of the target directory, make executable and run like this:

scala cronparser '*/15 0 1,5 * * /usr/bin/find'

Where cronparser is the name of the jar.

Alternatively, create alias in bash_profile:

cron-parser() {
  scala ~/path/to/directory/cronparser "$1"
}

and run with cron-parser '*/15 0 1,5 * * /usr/bin/find'