Hi, I have a list with the names of tables, e.g. l <- c("t1","t2","t3") and I want to change the colnames of each of the tables in a for loop like this: for (x in l) { colnames(eval(x)) <- lower.case(colnames(eval(x))) } This does not work but could someone give me some help to get on the right track? Thanks a million, Werner