Is it possible to swap columns around in a data frame using R?

dfrm <- dfrm[c("piglet", "ssire", "dam", "tdate")]

OR:

dfrm <- dfrm[ , c("piglet", "ssire", "dam", "tdate")]

d <- data.frame(a=1:3, b=11:13, c=21:23)
d
#  a  b  c
#1 1 11 21
#2 2 12 22
#3 3 13 23
d2 <- d[,c("b", "c", "a")]
d2
#   b  c a
#1 11 21 1
#2 12 22 2
#3 13 23 3

or you can do same thing using index:

d3 <- d[,c(2, 3, 1)]
d3
#   b  c a
#1 11 21 1
#2 12 22 2
#3 13 23 3