得到mac电脑的生产日期（通过一个私有库））

- (NSString *)getProduceDate {
    NSString *modelIdentifier = @"";
    NSString *cmd1 = @"system_profiler SPHardwareDataType | grep 'Model Identifier'";
    modelIdentifier = [self executeCommand:cmd1];
    modelIdentifier = [modelIdentifier substringFromIndex:24];
    modelIdentifier = [modelIdentifier stringByReplacingOccurrencesOfString:@"\n" withString:@""];
    
    NSString *date = @"";
    NSString *path = @"/System/Library/PrivateFrameworks/ServerInformation.framework/Versions/A/Resources/English.lproj/SIMachineAttributes.plist";
    NSDictionary *SIMachineAttributesDic = [[NSDictionary alloc] initWithContentsOfFile:path];
    for (NSString *s in SIMachineAttributesDic.allKeys) {
        if ([s isEqualToString:modelIdentifier]) {
            NSDictionary *infoDic = [[SIMachineAttributesDic objectForKey:s] objectForKey:@"_LOCALIZABLE_"];
            date = [infoDic objectForKey:@"marketingModel"];
            break;
        }
    }
    
    return date;
}

- (NSString *)executeCommand:(NSString *)cmd
{
    NSTask *task = [[NSTask alloc] init];
    [task setLaunchPath: @"/bin/bash"];
    NSArray *arguments = [NSArray arrayWithObjects: @"-c", cmd, nil];
    [task setArguments: arguments];
    
    NSPipe *pipe = [NSPipe pipe];
    [task setStandardOutput: pipe];
    
    NSFileHandle *file = [pipe fileHandleForReading];
    [task launch];
    
    NSData *data = [file readDataToEndOfFile];
    NSString *retStr = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
    [file closeFile];
    
    return retStr;
}