Character vectors 

Beatles <- c("John", "Paul", "George", "Ringo")
Beatles

[1] "John"   "Paul"   "George" "Ringo" 

paste("one","and","only")

[1] "one and only"

paste(Beatles, collapse=" & ")

[1] "John & Paul & George & Ringo"

First <- c("Mick","Keith","Ronnie","Charlie")
Last <- c("Jagger","Richards","Wood","Watts")

paste(First,Last)

[1] "Mick Jagger"    "Keith Richards" "Ronnie Wood"    "Charlie Watts" 

paste(First,Last,sep="_")

[1] "Mick_Jagger"    "Keith_Richards" "Ronnie_Wood"    "Charlie_Watts" 

Beatles <- c("John", "Paul", "George", "Ringo")

substr(Beatles,1,2)

[1] "Jo" "Pa" "Ge" "Ri"

substr(Beatles,1:4,2:5)

[1] "Jo" "au" "or" "go"

Led.Zeppelin.song <- "Whole Lotta Love"
ACDC.song <- sub("Love","Rosie",Led.Zeppelin.song)
print(ACDC.song)

[1] "Whole Lotta Rosie"

onetofour <- 1:4
names(onetofour) <- c("first","second","third","fourth")

names(onetofour)

[1] "first"  "second" "third"  "fourth"

onetofour

 first second  third fourth 
     1      2      3      4 

print(onetofour)

 first second  third fourth 
     1      2      3      4