How to control the position of columns in a dataframe?

I have this dataframe

df = data.frame(x = 1:5,
                y = 6:10,
                z = 11:15,
                o = 16:20,
                m = 21:25)

And I want to change the position of columns in a simple way as follows :

1st column : m

2st column : z

3st column : o

4st column : x

5st column : y

How can we do that with a simple function ? Thanks.

>Solution :

You can do

df[c(5, 3, 4, 1, 2)]

or

df[c('m', 'z', 'o', 'x', 'y')]

or

df |> with(data.frame(m, z, o, x, y))

or if you are using dplyr

df %>% select(m, z, o, x, y)

All of which result in

   m  z  o x  y
1 21 11 16 1  6
2 22 12 17 2  7
3 23 13 18 3  8
4 24 14 19 4  9
5 25 15 20 5 10