how to change column names in r

1R> X <- data.frame(bad=1:3, worse=rnorm(3))
2R> X
3  bad     worse
41   1 -2.440467
52   2  1.320113
63   3 -0.306639
7R> colnames(X) <- c("good", "better")
8R> X
9  good    better
101    1 -2.440467
112    2  1.320113
123    3 -0.306639

1df <- df %>%
2  rename(newName1 = oldName1 ,
3         newName2 = oldName2)

1colnames(dataset) <- c('name1','name2',..)

1colnames(df)[colnames(df) == "name"] <- "new_name"

1names(df)[1] <- paste("newName")