information to pass to the shell script in the form of a variable
called '$1'. A common usage is to pass the install path of a recently
installed item. For this, you would enter the same Install To
path used for the Install Item. This field accepts the %INSTALL_VOLUME%
variable used in conjunction with the Allow User To Select Install
Volume feature (described in the Installer
Properties page of this documentation). Other variables accepted in this field are %INSTALLER_ITEMS% (Path to Installer Items folder inside the FileStorm installer bundle) and %SELF% (Path to the application bundle of installer or uninstaller).
field allows you to use one script in multiple actions, simply
by varying the parameters in each action. It also allows for shorter
shell scripts, as you don't need to hard code a specific path
in the script.