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Perl Terms and Definitions
List of terms and definitions taken from the Perl Specialist Student Guide - Glossary For quiz purposes, minor edits have been made to certain definitions so that the term is not in the definition.
Terms in this set (36)
An expression resulting in a numerical value as distinct from Boolean expressions.
An ordered list of scalar values.
A numbered value, enclosed in braces, that tells the Perl interpreter which array element to access.
An expression used to help determine the flow of execution, which evaluates as either true or false.
Code which indicates a list of characters that one element in a string will match. A negative value is one in which the element in a string does not match any characters in the list.
command line arguments
Values passed to a script or program by appending them to the command used to execute the script or program at the command line.
A special sequence of characters used to represent a nonprintable ASCII character or other character that, if used alone, has some significance within a programming language or expression.
An input/output connection between the program and a particular file or device.
A collection of scalar values that can be accessed individually using a key.
A relationship between two objects, in which one object "is" another object.
input/output (I/O) redirection
A mechanism by which the command line can be used to redirect input to, or output from, a script.
An arbitrary scalar value used to access a hash element.
An operator used to bridge two Boolean expressions to create a single expression.
A special character used to create a complex pattern.
A subroutine associated with an object.
A specially-designed Perl script that can be reused in scripts other than the one for which it was originally intended.
A table of variable names maintained by the Perl interpreter. Organizes code and protects the variables used in one section of a program from being inadvertently overwritten by another section.
An instance of a class with unique data (and its associated subroutines) and operations.
A package allows users to define a distinct namespace for a block of code.
An executable program that accepts the Perl script and executes the instructions contained within it.
Practical Extracting and Reporting Language (Perl)
A scripting language that includes some UNIX facilities. It is generally easier to learn and use than other, more structured languages.
A compiler directive, used to control the parsing and execution of a Perl script.
A common data structure that operates under LIFO (last in, first out) rules.
A value that points to another value.
An expression used to match patterns within a string.
A value passed from a subroutine to the calling routine.
The region of code within a program in which a variable or subroutine is accessible.
The first line in every Perl script. Instructs the operating system about the location of the Perl interpreter.
A command line interpreter.
A common data structure that operates under FIFO (first in, first out) rules.
The default output stream provided by the operating system. Text output to this may be directed to a terminal window, a file, a printer, or other output device.
STDIN (standard in)
A mechanism to retrieve data from the user while a script is executing.
A data element representing one or more alphanumeric characters.
Structured Query Language (SQL)
A language used to create high-performance databases.
A named block of code that can be called as needed throughout a program.
A special character that represents one or more characters.
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T F When the indirection operator is used with a pointer variable, you are act ally working with the value the pointer is pointing to.