Head
The file.head function returns the first line of the file. Only up to the first 256 characters are returned. If the file does not exist, or ASCII control characters (except tab) are read, it fails and nothing is returned.
Syntax
%file.head(string)
Example 1. Returning the first line of a file
string line
line := %file.head("/var/log/radius.log")File access restriction
Files accessed in this function are restricted by the limit files section in the main security configuration. If present in radiusd.conf, only files in the paths listed can be accessed.