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What is the difference between the function oriented and Object oriented approach in the modules (CPAN). Mention the merits as well demerits of these two types.
shalusanju
- Aug 14th, 2010
In the object-oriented style you create one or more CGI objects and then use object methods to create the various elements of the page. Each CGI object starts out with the list of named parameters tha...
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How to substitute a particular string in a file containing millions of records?
ratul2783
- May 3rd, 2010
perl -p -i -e "s/search_string/replace_string/g" SourceFileThe -p option ensures that $_ is assigned each line of each input file in turn and that the program is executed once for each input line.The ...
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Rename Datastage jobs through perl
Please provide me Perl scriptwhich reads the data from xcel sheet and renames the dsx file.Process followed to rename is:make a list of old and new file names in xcel sheet.compare the old file name in the xcel sheet with dsx name.If both are equal then assign the new name to the dsx which is mentioned in the xcel sheet.Kindly please help me in this.Expecting a reply soon..
gansi
- Sep 30th, 2009
use Win32::OLE;use Win32::OLE::Enum;use Win32::OLE qw(in with);use Win32::OLE::Const 'Microsoft Excel';use Win32::OLE::Variant;use Spreadsheet::ParseExcel;use Spreadsheet::WriteExcel;use Sprea...
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How to find type of variable?
How to find out whether reference is pointing to a scalar, array or hash?
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What does this symbol mean '->'
prabhath_01
- May 31st, 2008
Uses of "->" Operator:###################1) Reference the method of a module.use CGI;my $cgi = new CGI ();$cgi->header();2) In Perl it is an infix dereference operator. $arr = [ ...
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PERL Symbol Table
What is Symbol table and how it Works?
gireeshkumar.kg
- Jun 30th, 2009
Symbol table is a PERL structure which contains the identifier names(like 'variable'). The identifier became actual variable ($variable,@variable etc)?type when it associate through typeglob.Symbol table contains only global variables.
harjot kaur
- Jul 5th, 2008
The symbol table is the list of active symbols (functions, variables, objects) within a package. Each package has its own symbol table, and with some exceptions, all the identifiers starting with lett...
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What is difference between "Use" and "require". In which case should "Use" be used and not "Require"?
gireeshkumar.kg
- Jun 29th, 2009
1)Usei) use for loading the modules( Should not give the .pm extension)ii) The loaded module is verified at the compile time.2) Requirei) Use for loading the modules and perl programs( .pm extension i...
prabhasgupte
- Feb 12th, 2008
There is one more basic difference between 'use' and 'require'.When you 'use' the control is passed to that file at runtime.Whereas, when you 'require' the code from th...
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Explain the difference between "my" and "local" variable scope declarations. ?
Both of them are used to declare local variables.The variables declared with "my" can live only within the block it was defined and cannot get its visibility inherited functions called within that block, but one defined with "local" can live within the block and have its visibility in the functions called within that block.
gireeshkumar.kg
- Jun 29th, 2009
1) MyMy creates a new variable and gives a lexical scope for that variable.The variable? is not visible outside the block in which it is defined.2) LocalLocal saves the value of a global variable.It ...
vamshi_maham
- Oct 9th, 2007
Perl supports three scoping declarations that enable to create private variables (using my) , selectively global variable (using our) and temporary copies of selected global variables (using local) .....
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Why do you program in PERL
gireeshkumar.kg
- Jun 29th, 2009
* PERL is programmer friendly. It is easy to code and can do it in less number of lines. It does all the nice things with minimum fuzz.* Text manipulation is unmatched. * It has built-in regex.* Has the support of world's largest archive of modules(CPAN)
ashwini chavan
- Jul 22nd, 2008
It is having the features of scripting (Shell) as well as programming (like C). Using PERL you can easily do the system administration works where comparitively difficult with Shell script.
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What does 'qw(..)' mean? What's the use of it?when do we use it?
wow_suraj
- Jun 8th, 2009
qw stands for 'Quote word'. It usually used to create array. Ex. @arr = qw/one two three/; ...
gnana
- Oct 31st, 2006
The quoting opeator for lists is qw.advantage of qw is you need not quote the strings in additional way as qw already does quoting.
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What is the difference between object oriented and structured oriented progrmming?
vinkumardpi
- Nov 6th, 2008
* Object Oriented means programme will be their in terms of Class and Object relationship will be their.* Structured Oriented Means programme will be their in terms of multiple Functions.
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What does this mean : '$_' ?
ashwini chavan
- Jul 22nd, 2008
The most commonly used global scalar variable is the $_ variable. Many Perl functionsand operators modify the contents of $_ if you do not explicitly specify the scalarvariable on which they are to op...
prabhath_01
- May 31st, 2008
It is called as default variable in Perl.It hold the current value in any block ie., 'for' or 'while'. Eg.,******************************************print "n", $_ for (1..10)...
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What is hash in perl?
ashwini chavan
- Jul 22nd, 2008
Hash is an associative array where data is stored in "key"->"value" pairs.Eg : fruits is a hash having their names and price%fruits = ("Apple", "60", "Banana", "20", "Peers", "40");
wow_suraj
- May 2nd, 2008
Hash is also known as 'Associative array' sometimes. It basicaly contains of two parts first is key and value. It is very much like a name given for a value.Ex. A student with his/her roll number can ...
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What are the characteristics of project that is well suited to PERL
ashwini chavan
- Jul 22nd, 2008
When to use Perl1. For large text processing2. When application does lot of data manipulation3. When you need fast development4. For database loading operations5. When shell scrits grow to become libraries
bibhu prasanna behera
- Jun 25th, 2007
Actually it is used in automation testing....as a tester i am using per script for automation testing like running the tools etc.
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What is a subroutine?
nitashaa
- Jul 15th, 2008
One major difference between subroutine and function-A function definition must have a return statement whereas a subroutine always return value of last expression evaluated in case there is no return statement.
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What does the word '&myvariable' mean?what does the symbol '&' means? What's purpose of it?
nitashaa
- Jul 15th, 2008
&myvariable;It indicates 'myvariable' is a subroutine which is being called in the above statement .Its mandatory to use & keyword before subroutine name only when userdefined subrouti...
maruthr
- Apr 16th, 2008
There are three different formats to be used for calling the subroutines/methods,"hello" is the subroutine name, say1) &hello;Subroutine definition can be made anywhere in the fil...
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What's is the use of 'require' and what does this mean?
nitashaa
- Jul 15th, 2008
require function is used to load a seperate perl script or module in run time.If the file to be loaded is not in the directories listed in @INC array then full path of the perl file is to be passed in...
Swanand
- Mar 27th, 2007
'require' is like a preprocessor directive in C/C++ which imports the external file .You can use the subroutines inside the current source code which are defined in the external file.require 'coreDBlib.pl'?=>> #include
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"perl regular expressions are greedy" what does this mean?
prabhath_01
- May 31st, 2008
We have wild card characters like '*' and '+' in perl, which are greedy by natureEg:., Let's discuss with an example In the following string you want to match 'Perl is aw...
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What are regular expressions?
prabhath_01
- May 31st, 2008
Regular Expresiions is the heart of Perl language.Using this we can search and raplace with partcular pattern in a given text.We can read a file and replace all occurances of some word or pattern with...
Sunil Kartikey
- Sep 18th, 2006
A code line that defines a pattern for a search to match
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What is the use of "STDERR()"?
imavasu
- May 13th, 2008
Perl is like this but (being Perl) goes a step further. The following file handles are open by default:STDIN - Standard Input, for user control input, typically the keyboardSTDOUT - Standard Output,fo...
Fahad
- Sep 29th, 2006
Hi, this is what i found.STDERRThe special filehandle for standard error in any package.
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