Interpolation using double quotes, for example, (see Quote and Quote like Operators) can be used to concatenate 2 (or more) scalar variables into a 3rd scalar variable:

my $s1 = 'Perl';
my $s2 = 'Monks';
my $s3 = "$s1$s2";
print "$s3\n";
# $s3 contains 'PerlMonks'
[download]

or using this syntax:

my $s3 = "${s1}${s2}";
[download]

Interpolation of array variables can also be performed to concatenate all element of the array into a string. It is necessary to unset the LIST_SEPARATOR ($") special variable, and it is good practice to localize this change to its own block:

{
   undef $";
   my @strs = 'a' .. 'e';
   my $s4 = "@strs";
   print "$s4\n";
   # $s4 contains 'abcde'
}
[download]