I am working on a project that imports all csv files from a given folder and merges them into one file. I was able to import the rows and columns I wanted from each of the files from the folder but now need help merging them all into one file. I do not know how many files I will eventually end up with (probably around 120) so I do not want to merge them 1 by 1.

Here is what I have so far:

```
 # Import All files
 rowsToUse <- c(9:104,657:752)
 colsToUse <- c(15,27,28,29,30,33,35)
 filenames <- list.files("save", pattern="*.csv", full.names=TRUE)
 for (i in seq_along(filenames)) {
   assign(paste("df", i, sep = "."), read.csv(filenames[i])[!is.na(30),][rowsToUse,colsToUse])
 }

 # Merge into one file
 for (i in seq_along(filenames)) {
   df<-rbind(df.[i])
 }

```

The first part of the code creates a series of dataframes labled df.1, df.2, etc. I would like them to end up in one final dataframe called df. All files are identical in structure.

I would really appreciate some help if someone has a few extra minutes! Thank you!