how to input multiple .txt files

To repent for my sins, I'll also suggest that Hadley Wickham's "plyr"
package (http://had.co.nz/plyr/) is also useful/parsimonious in this
context:

a <- ldply(cust1_files,read.table)

You might also want to do

names(cust1_files) <- basename(cust1_files)

so that you can easily see where each part of the data came from
(although I think this will only work in the next version of plyr)

Hadley

http://had.co.nz/