4.17.3 Concatenation

Concatenation operator is ‘.’ (a dot). For example, if $f is ‘smith’, and $client_addr is ‘10.10.1.1’, then:

$f . "-" . $client_addr ⇒ "smith-10.10.1.1"

Any two adjacent literal strings are concatenated, producing a new string, e.g.

"GNU's" " not " "UNIX" ⇒ "GNU's not UNIX"