R语言中cat函数直接生成文件

1、测试1 直接生成文件

> dir()
character(0)
> cat("aaa", "bbb", file = "test.txt")  ## 直接生成文件
> dir()
[1] "test.txt"

2、在文件上追加 

> cat("1111", "222", file = "test.txt", append = T)

3、换行追加

> cat("mmm", "nnnn", "\n", file = "test.txt", append = T)

> cat("mmm", "nnnn", "\n", file = "test.txt", append = T)