rename columns based on a variable in r

1# df = dataframe
2# old.var.name = The name you don't like anymore
3# new.var.name = The name you want to get
4
5names(df)[names(df) == 'old.var.name'] <- 'new.var.name'

1my_data %>% 
2  rename(
3    sepal_length = Sepal.Length,
4    sepal_width = Sepal.Width
5    )

1df <- rename(df, new_name = old_name) #For renaming dataframe column
2 
3tbl <- rename(tbl, new_name = old_name) #For renaming tibble column
4 
5tbl <- tbl %>% rename(new_name = old_name) #For renaming tibble column using dplyrpipe 
6                                           #operator 
7