use or require?

perldoc -f use
perldoc -f require
perldoc lib
perldoc -f push

* use Module

Imports some semantics into the current package from the
named module, generally by aliasing certain subroutine
or variable names into your package. It is exactly
equivalent to

BEGIN { require Module; import Module LIST; }


* require file

Demands that a library file be included if it hasn't already been included.

* use lib

This is a small simple module which simplifies the manipulation of @INC at compile time.

It is typically used to add extra directories to perl's search path so that later `use' or `require' statements will find modules which are not located on perl's default search path.


*  push ARRAY,LIST

Treats ARRAY as a stack, and pushes the values of LIST onto the end of ARRAY. The length of ARRAY increases by the length of LIST. Has the same effect as

for $value (LIST) {
  $ARRAY[++$#ARRAY] = $value;
}

but is more efficient. Returns the new number of elements in the array.