.Dd $Mdocdate: September 25 2015 $
.Dt TEST 1
.Os
.Sh NAME
.Nm test
.Nd condition evaluation utility
.Sh SYNOPSIS
.Nm test
.Ar expression
.Nm \&[
.Ar expression Cm \&]
.Sh DESCRIPTION
.Bl -enum
.It
The standard way to escape a delimiter in a macro argument is to
prepend a zero-width space, like this:
.Bd -ragged -offset indent
The
.Fl \&?
option displays a summary of the commands.
.Ed
.Pp
Appending the zero-width space or enclosing the delimiter in double
quotes works too, but isn't recommended because these methods are
less commonly used:
.Bd -literal -offset indent
\&.Fl \e&?
\&.Fl ?\e&
\&.Fl "?"
.Ed
.It
If escaping is forgotten, delimiters fall out of the macros.
If that leaves the macros empty, they may assume their default arguments.
For example,
.Pp
.Dl .Nm \&[ \&Ar expression \&Cm \&]
.Pp
yields
.Pp
.D1 Nm [ Ar expression Cm ]
.Pp
where the square brackets are not set in bold face.
.El