title: How to execute shell-command "ping" and get result into string in Objective-C/Cocoa?
body: <p>I tried this code</p>
  
  <pre><code>NSTask *task;
  task = [[NSTask alloc] init];
  [task setLaunchPath: @"/usr/bin/ping"];
  
  NSArray *arguments;
  arguments = [NSArray arrayWithObjects: @"-c", @"3",@"stackoverfow.com", nil];
  [task setArguments: arguments];
  
  NSPipe *pipe;
  pipe = [NSPipe pipe];
  [task setStandardOutput: pipe];
  
  NSFileHandle *file;
  file = [pipe fileHandleForReading];
  
  [task launch];
  
  NSData *data;
  data = [file readDataToEndOfFile];
  
  NSString *string;
  string = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
  NSLog (@"ping returned:\n%@", string);
  
  [string release];
  [task release];
  </code></pre>
  
  <p>And got this </p>
  
  <pre><code>2011-10-21 17:34:42.805 pintTest[8819:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'launch path not accessible'
  *** First throw call stack:
  (
      0   CoreFoundation                      0x00007fff8acab286 __exceptionPreprocess + 198
      1   libobjc.A.dylib                     0x00007fff89463d5e objc_exception_throw + 43
      2   CoreFoundation                      0x00007fff8acab0ba +[NSException raise:format:arguments:] + 106
      3   CoreFoundation                      0x00007fff8acab044 +[NSException raise:format:] + 116
      4   Foundation                          0x00007fff8fc6c2c8 -[NSConcreteTask launchWithDictionary:] + 470
      5   pintTest                            0x0000000100000de0 main + 400
      6   pintTest                            0x0000000100000c44 start + 52
      7   ???                                 0x0000000000000001 0x0 + 1
  )
  terminate called throwing an exceptionsharedlibrary apply-load-rules all
  Current language:  auto; currently objective-c
  </code></pre>