Creating a template should read from stdin

[jacobtomlinson]

A nice feature would be for template creation to read from stdin. Currently when you run krontab create template <name> a blank template file will be opened in a text editor.

It would be nice if we could pipe some text into that command to give us a starting point. For example we could effectively duplicate the default template by running

krontab get template default | krontab create template <new template>

This would open the new template for editing but the file would be already populated with the contents of the default template.

We could also include a flag to skip the interactive part which would allow a one line duplication. We should also think about what happens if the user exits from the test editor without saving, should it create the new template or not?

[jacobtomlinson]

Might be helpful https://flaviocopes.com/go-shell-pipes/