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