Visual Cron

visualcron helps to visualise a cron expression

Usage

1 argument is required, a string representation of a cron expression

$ visualcron "*/15 0 1,15 * 1-5 /usr/bin/find"

This will output the expression in table format

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

Development

For local development, Go must be installed

Note: A minimum Go version of 1.13.0 is required

Makefile

A makefile has been generated to ease testing, building and running visualcron

The makefile has 3 depenencies

• make (yum, apt, chocolatey) to run the make commands
• go (http://golang.org) to run the go related commands
• gox (go get github.com/mitchellh/gox) to build binaries

The available commands are

• test - run the unit tests and print coverage
• test-cover - run the unit test and generate HTML coverage
• build - build the binaries for Linux, Mac, and Windows
• run - run
• fmt - run "go fmt"

Building

gox is used to build cross compatible versions of visualcron

For example, the following will build a Linux, Mac and Windows binary in the builds/ directory

go get -v github.com/mitchellh/gox
gox -verbose -osarch="linux/amd64 darwin/amd64 windows/amd64" -output "builds/visualcron_{{.OS}}_{{.Arch}}"

Testing

The unit tests can be executed with

go test -v ./...

Unit test coverage is currently at 92.4%

Author

Michael Bell