[Feature Request] Allow defining variables on command line

[Hubert Grzeskowiak]

In many cases you'll have templates with just one or two variables. It's quite a hassle to create a data file each time.

[Mark]

Just use environment variables:

$ echo "Value: {{ A }}" > /tmp/test.j2 
$ export A=123
$ j2 /tmp/test.j2
Value: 123