Unable to capture output from QProcess

QString output;
QProcess *process = new QProcess();
/* testing QProcess documentation synchronous example */
process->start("sh", QStringList() << "-c" << s);
if (!process->waitForStarted())
    output = "QProcess failed to start, with error [" + process->errorString() + "]"; if (!process->waitForFinished())
    output = "QProcess failed to finish, with error [" + process->errorString() + "]";
output = QString(process->readAll());
delete process;