Session.2 Workspace and Files

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)