Add file extension to all files in a folder in R

Question

As a result from a loop I have a lot of files without a file extension in a folder.

How could I add a file extension (.png) to all files in the folder while keeping the original name, e.g. from NAME1 to NAME1.png, NAME3 to NAME3.png, NAME6 to NAME6.png etc using R?

Answer 1

Install the pathological package and use replace_extension.

library(devtools)
install_github("pathological", "richierocks")

library(pathological)
old_filenames <- paste0("NAME", 1:6)
new_filenames <- replace_extension(, "png")
file.rename(old_filenames, new_filenames)

Answer 2

With the list.files function you can retrieve the file names under a given path and with a given pattern. From them you can use paste to add your file extension and next file.rename to rename the files. For instance:

    oldNames<-list.files(...) #some argument here
    newNames<-paste(sep="",oldNames,".png")
    for (i in 1:length(oldNames)) file.rename(oldNames[i],newNames[i])