Following are the ways to get realpaths:

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[aw2.get realpath.home /]
This will return – root path of website

Eg. if you use this is domain_name.com then it will return
/var/www/domain_name.com/htdocs/”

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[aw2.get realpath.app_folder /]
This will return – root path of the app your are currently working with

Eg. if you use this is domain_name.com in examaple-app then it will return
/var/www/domain_name.com/examaple-app-docs/

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[aw2.get realpath.template_folder/]
This will return – root path of templates folder
Eg. if you use this is domain_name.com in then it will return
/var/www/domain_name.com/templates/
(note: please confirm this shortcode in prior of using)