exec system command

gistfile1.m

- (NSString *)runCommand:(NSString *)command {
    NSTask *task  = [[NSTask alloc] init];
    NSPipe *pipe  = [[NSPipe alloc] init];
    
    [task setLaunchPath: @"/bin/sh"];
    [task setArguments: [NSArray arrayWithObjects:@"-c", command, nil]];
    
    [task setStandardOutput: pipe];
    [task launch];
    
    NSFileHandle *handle = [pipe fileHandleForReading];
    NSData *data = [handle  readDataToEndOfFile];
    NSString *result = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
    
    [pipe release];
    [task release];
    
    return result;
}