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encoding (especially including binary data), the pipeline must be
\fBopen\fRed, configured and read explicitly.
.PP
If the initial arguments to \fBexec\fR start with \fB\-\fR then
they are treated as command-line switches and are not part
of the pipeline specification. The following switches are
currently supported:
.\" OPTION: -ignorestderr
.TP 13
\fB\-ignorestderr\fR
.
Stops the \fBexec\fR command from treating the output of messages to the
pipeline's standard error channel as an error case.
.\" OPTION: -keepnewline
.TP 13
\fB\-keepnewline\fR
.
Retains a trailing newline in the pipeline's output.
Normally a trailing newline will be deleted.
.\" OPTION: --
.TP 13
\fB\-\|\-\fR
.
Marks the end of switches. The argument following this one will
be treated as the first \fIarg\fR even if it starts with a \fB\-\fR.
.PP
If an \fIarg\fR (or pair of \fIarg\fRs) has one of the forms
|