=over

=item unshift ARRAY,LIST
X<unshift>

=item unshift EXPR,LIST

Does the opposite of a C<shift>.  Or the opposite of a C<push>,
depending on how you look at it.  Prepends list to the front of the
array, and returns the new number of elements in the array.

    unshift(@ARGV, '-e') unless $ARGV[0] =~ /^-/;

Note the LIST is prepended whole, not one element at a time, so the
prepended elements stay in the same order.  Use C<reverse> to do the
reverse.

Starting with Perl 5.14, C<unshift> can take a scalar EXPR, which must hold
a reference to an unblessed array.  The argument will be dereferenced
automatically.  This aspect of C<unshift> is considered highly
experimental.  The exact behaviour may change in a future version of Perl.

=back