File renaming using R

Given that you are in the right working directory (otherwise set it with setwd(""), you can change file names with:

from1 <- c("test_file.csv", "plot1.svg")
to1 <- c("test.csv", "plot.svg")

file.rename(from1, to1)

But make sure that you are in the right directory and that the files exist (which you can do with list.files or file.exists.