关于读取保存在 rda 文件中的数据信息

Question

For a.rda file, after loading it, except viewing it using Rtudio window, are there any functions that can list all the data information stored in this rda file?

Answer 1

When I want to see what's in an .rda file without loading it into my current environment, I load it into a temp env:

e <- new.env(parent = emptyenv())
load("path/to/file.rda", envir=e)
ls(e)     # shows names of variables stored in it
ls.str(e) # shows a `str` presentation of all variables within it

Not the most efficient way, as it requires that you load the contents before listing them. I don't think it's easy to look at a raw rda file on-disk and know its contents without loading it in some fashion.