How to add a dot to a raw man file at the end of a line?

Question

I've got a fragment of a manual file which looks like this:

.TP
.I krb5_key_file
Location of the key for this client's principal.
Note that the key file must be owned by root and mode 0400.
The default is
.I /etc/audit/audit.key

I would like to add an unformatted dot (.) at the end of this fragment.

1. Adding a dot at the end of the last line like this

   [...]
   .I /etc/audit/audit.key.
   

   doesn't work because the dot is being underlined.

2. Adding an escaped dot in a new line

   [...]
   .I /etc/audit/audit.key
   \[char46]
   

   doesn't work as well because a space character is inserted between /etc/audit/audit.key and the dot: /etc/audit/audit.key ..

How can I solve this?

Answer 1

There are a number of 2-character macros that let you format their arguments in two different fonts, alternating between them. In your case, you'd use the .IR macro. R means Roman, the default font.

The default is 
.IR /etc/audit/audit.key .

Answer 2

You can use the alternative method of setting italics/underline mode: \fI. Then \fP to return to previous font:

So you would have

\fI/etc/audit/audit.key\fP.

Answer 3

One solution is to do it like this:

The default is \fI/etc/audit/audit.key\fP.