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BY
SANA MATEEN
6/13/2016 1Introduction to scripts and scripting
INTRODUCTION TO SCRIPTS AND SCRIPTING
 Script is a program written for special runtime environment that automate the
execution of tasks.
 Scripting is the action of writing scripts using scripting language.
 Scripting Language are used to extend the functionality of software . For
example enhancing web pages by providing dynamic content.
 They are designed to automate frequently used task that usually involve calling
or passing commands to external program.
Examples:
1. PERL- PRACTICAL EXTRACTION AND REPORT LANGUAGE
2. PHP-Hypertext Preprocessor(Personal Home Page)
3. TCL-Tool Command Language and PYTHON
TCL
6/13/2016 2Introduction to scripts and scripting
SCRIPTING VS. PROGRAMMING: IS THERE A
DIFFERENCE?
Scripting Programming
 Scripts are interpreted . It means
they are processed from scratch
every time you run them.
 Programs are executed.
Problems addressed by Scripting language
 Building applications from off-the-shelf components.
 Example:
Use of Visual Basic to develop GUI using prebuilt Visual Controls.
 Controlling applications that have a programmable interface(protocols
to be followed while building a software).
 Speed of development is more important than runtime efficiency.
6/13/2016 3Introduction to scripts and scripting
ORIGIN OF SCRIPTING
 The UNIX O.S developers coined the term shellscript for sequence of commands that
were read from a file and followed in sequence.
 Script is a file that is intended to be executed directly rather than being compiled.
 Examples of scripts with respect to unix system are:
 AWK: This utility reads the standard input line by line and takes an action on part of
entire line.
 These actions are specified in awk script that consist of list of instructions.
 Perl: is a scripting language developed by Larry Wall, especially designed for text
processing.
 Though Perl is not officially an acronym but many times it is used as it stands
for Practical Extraction and Report Language.
 It runs on a variety of platforms, such as Windows, Mac OS, and the various versions
of UNIX.
6/13/2016 4Introduction to scripts and scripting
ORIGIN OF SCRIPTING
 In DOS(Disk Operating System), use of dial up connection to remote system
require scripts that automate the sequence of operation required to establish a
connection to remote system.
 Use rasphone( Remote Access Phonebook) command.
 Another occurrence of script was in Apple Macintosh HyperCard Application,
which is one of the Hypertext system.
6/13/2016 5Introduction to scripts and scripting
SCRIPTING TODAY
 Scripting allows application to be developed much faster than traditional
methods allow.
 We can use it to manipulate,customize,automate the facilities of existing
system.
 Eg: Use of client side scripting and Dynamic HTML to create interactive and
feature rich enhanced web pages.
 Using Scripting Language with its rich functionality .These are used by UNIX
admin for System maintenance work, like managing user permissions.
 Windows system admin adopt Perl for their work.
 Apache web server has an embedded Perl interpreter for CGI scripts
6/13/2016 6Introduction to scripts and scripting
CGI SCRIPT ISAPI TECHNOLOGY
 CGI stands for Common Gateway
Interface.
 It defines a standard way in which
information may be passed to and
from the browser and server.
 CGI scripts can be written using
PERL.
 ISAPI stands for Internet Server
Application Program Interface
technology . It is set of window program
calls that let you write a web server
application that will run faster than CGI.
 We can create Dynamic Link Library
application file using this technology.
 We can write an ISAPI script in any
language that will create an executable
object on your system. For example, C++,
Visual Basic, or Perl script on Windows.
6/13/2016 7Introduction to scripts and scripting

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Introduction to scripts

  • 1. BY SANA MATEEN 6/13/2016 1Introduction to scripts and scripting
  • 2. INTRODUCTION TO SCRIPTS AND SCRIPTING  Script is a program written for special runtime environment that automate the execution of tasks.  Scripting is the action of writing scripts using scripting language.  Scripting Language are used to extend the functionality of software . For example enhancing web pages by providing dynamic content.  They are designed to automate frequently used task that usually involve calling or passing commands to external program. Examples: 1. PERL- PRACTICAL EXTRACTION AND REPORT LANGUAGE 2. PHP-Hypertext Preprocessor(Personal Home Page) 3. TCL-Tool Command Language and PYTHON TCL 6/13/2016 2Introduction to scripts and scripting
  • 3. SCRIPTING VS. PROGRAMMING: IS THERE A DIFFERENCE? Scripting Programming  Scripts are interpreted . It means they are processed from scratch every time you run them.  Programs are executed. Problems addressed by Scripting language  Building applications from off-the-shelf components.  Example: Use of Visual Basic to develop GUI using prebuilt Visual Controls.  Controlling applications that have a programmable interface(protocols to be followed while building a software).  Speed of development is more important than runtime efficiency. 6/13/2016 3Introduction to scripts and scripting
  • 4. ORIGIN OF SCRIPTING  The UNIX O.S developers coined the term shellscript for sequence of commands that were read from a file and followed in sequence.  Script is a file that is intended to be executed directly rather than being compiled.  Examples of scripts with respect to unix system are:  AWK: This utility reads the standard input line by line and takes an action on part of entire line.  These actions are specified in awk script that consist of list of instructions.  Perl: is a scripting language developed by Larry Wall, especially designed for text processing.  Though Perl is not officially an acronym but many times it is used as it stands for Practical Extraction and Report Language.  It runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. 6/13/2016 4Introduction to scripts and scripting
  • 5. ORIGIN OF SCRIPTING  In DOS(Disk Operating System), use of dial up connection to remote system require scripts that automate the sequence of operation required to establish a connection to remote system.  Use rasphone( Remote Access Phonebook) command.  Another occurrence of script was in Apple Macintosh HyperCard Application, which is one of the Hypertext system. 6/13/2016 5Introduction to scripts and scripting
  • 6. SCRIPTING TODAY  Scripting allows application to be developed much faster than traditional methods allow.  We can use it to manipulate,customize,automate the facilities of existing system.  Eg: Use of client side scripting and Dynamic HTML to create interactive and feature rich enhanced web pages.  Using Scripting Language with its rich functionality .These are used by UNIX admin for System maintenance work, like managing user permissions.  Windows system admin adopt Perl for their work.  Apache web server has an embedded Perl interpreter for CGI scripts 6/13/2016 6Introduction to scripts and scripting
  • 7. CGI SCRIPT ISAPI TECHNOLOGY  CGI stands for Common Gateway Interface.  It defines a standard way in which information may be passed to and from the browser and server.  CGI scripts can be written using PERL.  ISAPI stands for Internet Server Application Program Interface technology . It is set of window program calls that let you write a web server application that will run faster than CGI.  We can create Dynamic Link Library application file using this technology.  We can write an ISAPI script in any language that will create an executable object on your system. For example, C++, Visual Basic, or Perl script on Windows. 6/13/2016 7Introduction to scripts and scripting