Note that %(profile) can also pull entries from the context as well
as the profile
lit literal string Set \fIstr\fR to \fIarg\fR.
lit string Clear \fIstr\fR.
getenv literal string Set \fIstr\fR to environment value of \fIarg\fR
-profile literal string Set \fIstr\fR to profile component \fIarg\fR
- value
+profile literal string Set \fIstr\fR to profile or context
+ component \fIarg\fR value
.\" dat literal int return value of dat[arg]
nonzero expr boolean \fInum\fR is non-zero
zero expr boolean \fInum\fR is zero