Perl is a highly capable programming language that can be used in both procedural and object-oriented styles, and is well-suited for text processing tasks like CGI programming. The document provides an introduction to basic Perl concepts like scalar and array variables, hashes, file handling, and control structures. It also demonstrates how to define and manipulate strings, arrays, and files in Perl code examples.

1. Basic Introduction To Perl Programming

8. Character Description Bell Escapes the next character nn Creates Octal formatted numbers nn Creates Hexideciamal formatted numbers X Control characters, x may be any character Do not match the pattern Ends , , or functions

11. Arithmetic Operators Assignment Operator Logical Operator Operator Use + Addition - Subtraction * Multiplication ** Exponents % Modulus / Division Operator Use Syntax + = Addition ($x += 10) - = Subtraction ($x -= 10) * = Multiplication ($x **= 10) ** = Exponents ($x **= 10) % = Modulus ($x %= 10) / = Division ($x /= 10) Operator Use &&, and Associates two variables using AND ||, or Associates two variables using OR

12. Relational Operators Operator Use Syntax Result ==,eq Equal To 5 == 5 5 eq 5 True != ,ne Not Equal To 6 !=5 6 ne 5 True < ,lt Less Than 7<4 7 lt 4 False >,gt Greater Than 7>4 7 gt 4 True <=,le Less Than Equal To 7<== 11 7 le 11 True >=, ge Greater Than Equal To 7>=11 7 ge 11 False

23. Remove a File Remove Multiple Files #!/usr/bin/perl print &quot;content-type: text/html &quot;; #The header $file = &quot;newtext.txt&quot;; if (unlink($file) == 0) { print &quot;File deleted successfully.&quot;; } else { print &quot;File was not deleted.&quot;; } #!/usr/bin/perl print &quot;content-type: text/html &quot;; #The header @files = (&quot;newtext.txt&quot;,&quot;moretext.txt&quot;,&quot;yetmoretext.txt&quot;); foreach $file (@files) { unlink($file); }