Workspace and Files
getwd(): return the current working dictionary
ls(): List all the objects in the local workspace
list.files() or dir(): List all the files in the working directory
args(): return what should be included in the function.
> args(list.files)
> function (path = ".", pattern = NULL, all.files = FALSE, full.names = FALSE,
recursive = FALSE, ignore.case = FALSE, include.dirs = FALSE, no.. = FALSE)
NULL
dir.create(): create a folder under the current workspace
> dir.create("testdir")
## create a folder under the current workspace under the current worksapce
file.create(): create .R file in the current workspace
> file.create("mytest.R")
list.files(): list all the files in the current folder
file.exists(): check if the file exists in the current folder
> file.exists("mytest.R")
> TRUE
file.info(): return the iformation of the file
> file.info("mytest.R")
> size isdir mode mtime ctime atime exe
mytest.R 0 FALSE 666 2016-11-25 17:38:43 2016-11-25 17:38:43 2016-11-25 17:38:43 no
file.rename(" ", " "): rename the file
> file.rename("mytest.R", "mytest2.R")
file.copy(" ", " "): copy the file
> file.copy("mytest2.R", "mytest3.R")
file.path(): return the relative path to the file
Combination of dir.create() and file.path()
> dir.create(file.path("testdir2", "testdir3"), recursive = TRUE)
## create folder "testdir2" and subfolder "testdir3" in the current workspace with the option "recursive" is TRUE
unlink(): delete the folder
> unlink("testdir", recursive = TRUE)
最后編輯于 ：2017.12.04 16:17:27
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