Miscellaneous

• defined expr
• Tests whether the lvalue expr has an actual value.
• do filename
• Executes filename as a Perl script. See also require in the section called "Subroutines, Packages, and Modules".
• dump [ label ]
• Immediate core dump. When reincarnated, starts at label.
• eval { expr;... }
• Executes the code between { and }. Traps runtime errors as described with eval(expr ), in the section called "String Functions".
• local variable
• local ( list )
• Creates a scope for the listed variables local to the enclosing block, subroutine, or eval.
• my variable
• my ( list )
• Creates a scope for the listed variables lexically local to the enclosing block, subroutine, or eval.
• ref expr(dagger)
• Returns a true value if expr is a reference. Returns the package name if expr has been blessed into a package.
• reset [ expr ]
• Resets ?? searches so that they work again. expr is a list of single letters. All variables and arrays beginning with one of those letters are reset to their pristine state. Only affects the current package.
• scalar expr
• Forces evaluation of expr in scalar context.
• undef [ lvalue ]
• Undefines the lvalue. Always returns the undefined value.
• wantarray
• Returns true if the current context expects an array value.