Each entry is a logical line, with physical lines terminated by a backslash (\) to indicate continuation. Entries are composed of options that are delimited by a blank space. Each option is a name-value pair in the following format:
Values can be colon-separated lists. No blank space is allowed within an option assignment.
Comment lines begin with a pound sign (#) and occupy the entire line up to a newline character. Blank lines are ignored, even within multiple-line entries.
The types of Permissions file entries are as follows:
When a remote machine calls you, its identity is questionable unless the remote machine has a unique login and verifiable password.
LOGNAME entries contain a LOGNAME option. MACHINE entries contain a MACHINE option. One entry can contain both options.