Add CombinedOutput

With the fix to Stdout/Stderr handling, we can now implement CombinedOutput()

Signed-off-by: Ronald G Minnich <rminnich@gmail.com>

Author: rminnich

client/client.go

@@ -569,6 +569,21 @@ func (c *Cmd) Run() error {
 	return c.Wait()
 }
 
+func (c *Cmd) CombinedOutput() ([]byte, error) {
+	r, w, err := os.Pipe()
+	if err != nil {
+		return nil, err
+	}
+
+	c.Stdout, c.Stderr = w, w
+
+	cpuerr := c.Run()
+
+	b, err := io.ReadAll(r)
+
+	return b, errors.Join(cpuerr, err)
+}
+
 // TTYIn manages tty input for a cpu session.
 // It exists mainly to deal with ~.
 func (c *Cmd) TTYIn(s *ssh.Session, w io.WriteCloser, r io.Reader) {