Perl

Mar 22, 2019

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Perl. Practical Extraction and Report Language. Objectives. Introduction Basic features Variables Operators and functions Control structures Input and output. Introduction to Perl. Perl is a script language Elements of csh, sh, awk and C Used for: Text manipulation CGI scripting

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Perl

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Perl

Perl. Day 3. 1 + 1 = 2. We’ve previously seen you can do math on variables $Num=1 $Num2=$Num+7; print(“$Num2 ”); You can even do math on the same variable: $Num1=$Num1+7; A commonly used short cut for adding 1 to a number is: $Num1++; Likewise you can subtract one: $Num1--;

387 views • 17 slides

Perl

Perl. COMP 205 - Week 7 Dr. Chunbo Chu. Introduction to Perl. P ractical E xtraction and R eport L anguage Created by Larry Wall in the mid-1980s Uses Administration (Shell scripts) Web (CGI, web engines) Good at Text processing Small/Medium sized projects

1.14k views • 86 slides

PERL

PERL. More references, complex data types and objects. References in Perl. An alternative mechanism of using variables such as arrays or associative arrays. Useful to think of a reference as the address of the object in memory.

412 views • 20 slides

Perl

Perl. Programming with the “Swiss Army Chainsaw” of scripting languages. Starting Simple. We will start presuming you have already installed a Perl interpreter such as strawberry If using linux you need to start your file with #!/ usr /local/bin/ perl

447 views • 20 slides

Perl

Perl. File I/O and Arrays. File I/O. Perl allows to open a file to read, write, or append As well as pipe input or output to another program. We get to this piping later on Command open (FILEHANDLE, "filename"); #read a file open (FILEHANDLE, "<filename");# same

655 views • 45 slides

Perl

Perl. regular expressions: string matching. string matching. For this lecture, we focus on string matching using a if statement The format if ($str =~ /pattern to match/) # true when match if ($str !~ /patch to match/) #true when no match the same as

509 views • 35 slides

PERL

PERL. Just like C but with its own set of quirks. Variables. There is no datatype PERL is loosely typed language Variables take on the data type of the data assigned to them Two forms Scalar: single-valued variable Starts with a $ Array: multi-valued (indexed) variable Starts with a @.

264 views • 10 slides

PERL

PERL. Perl Power!. Who uses Perl? Sites with heavy traffic that need excellent text processing capabilities Compiler optimization is also done in Perl System Administrators(the impatient ones, to be exact.) The Swiss Army Knife Language

1.03k views • 76 slides

Perl

Perl. Perl. Perl - Practical extraction report language for text files system management combines C, SED, AWK, SH interpreted dynamic. Data Structures. scalars $num arrays @num associative arrays %num $num[50] 50th element of the array num $#num last index of num. Examples.

538 views • 35 slides

Perl

Perl. Perl basics Perl Elements Arrays and Hashes Control statements Operators OOP in Perl. Scripting languages. Scripting language control an application typically not strongly typed typically interpreted (or compiled into byte-code)

414 views • 16 slides

PERL

PERL. History. Introduced in 1987 Created by Larry Wall Designed with the idea to incorporate parts of C, sed, awk, Unix shell scripting, and Lisp into one language. The second version of Perl was released 8 months after the first version. History.

250 views • 10 slides

Perl

Perl. Hour 4 Lists and Arrays. Lists. List is a sequence of scalars Surrounded by parentheses; items separated by commas (‘a’, 5, $alfa, ‘$_’, “the $item”) Usual variable substitution rules apply. List Shortcuts. qw(the $speed $color fox) Creates list from each word with single quotes

280 views • 13 slides

Perl

Perl. Introduction. Why Perl?. Powerful text manipulation capabilities Has a wide range of libraries available Fast Good support for file and process operations Widely used scripting language Alternatives: Python, Ruby. Less suiteable for:. Building large and complex applications

1.46k views • 126 slides

Perl

Perl. Regular expression: string manipulation. substr function. string = substr(string2,start pos (starts with 0), offset) returns a substring after the start point to offset string2 is not changed $str2 = "Hi There"; $str = substr($str2, 3, 2);

453 views • 29 slides

Perl

Perl. data, scalar data types and control structures. General information about Perl. PERL stands for P ractical E xtraction and R eport L anguage OR P athologically E clectic R ubbish L ister Perl's chief creator is Larry Wall (endorses both names)

580 views • 43 slides

Perl

Perl. OBJECTIVES. What is Perl Concepts Variables Control Structures Modules Objects Windows. Perl. P ractical E xtraction and R eport L anguage Originally designed as a text processing and “glue” language Perl is a scripting language

843 views • 57 slides

Perl

Perl. a bit of history…. Perl created in 1987 by Larry Wall. “Perl was designed to work more like a natural language.”. Perl is open source. “So, whatever it takes to give away my software and get it used, that’s great.”. Probably best known as a CGIscripting language. References.

284 views • 11 slides

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