Listing 4. Second Push Button

void demo_1::on_pushButton_2_clicked()
{  ui.textEdit->clear() ;
   QByteArray command_line, work_dir("/tmp"), result ;
   command_line = "ls /home" ;
   result="Nothing happened." ;
   QProcess shell(this) ;
   shell.setWorkingDirectory( work_dir) ;
   shell.start(command_line) ;
   if ( shell.waitForFinished(300)) //ms timeout
      result =  shell.readAllStandardOutput() ;
   ui.textEdit->append(result) ;
}