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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 eval in perl?
sapam
- Apr 1st, 2008
The eval function provides a very simple way of checking certain events without affecting the overall execution of your script. In essence, the eval function just initiates a new instance of the Perl ...
acraul7
- Mar 5th, 2008
Eval is also used for evaluating expressions.For eg:$a = 1;$b = 3;$c = '$a*$b';print(eval "$c"); // This prints 3
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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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How to find type of variable?
How to find out whether reference is pointing to a scalar, array or hash?
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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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What's the significance of @ISA, @EXPORT @EXPORT_OK %EXPORT_TAGS list & hashes in a perl package? With example?
Jatin
- Jan 5th, 2013
%EXPORT_TAGS = (tag_name => [anonymous array/Array reference]); It is to provide the tag to Anonymous array/Array reference which is generally @EXPORT_OK for example: %EXPORT_TAGS = (all => @EXPORT_O...
terrytlin
- Dec 3rd, 2009
Package NewModule;use Exporter; # an application by ‘use’ operator.# This Exporter package has @ISA array to look for a specific method, this array keeps track of classes it is inheriting....
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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 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 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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Any kind of help will be appreciated.
Thanks,
Shiv">Hi All,I would like to replace some entities in the text file with symbols using Perl.This is working fine for some special symbols but for the characters such as Zeta we should use Unicode/Hexadecimal values - xcex96. We are doing like this s/&zeta1;/"xcexb6"/g; . This is working fine only for 2 characters such as xb6. How to use this in Perl? How to make use unicode value for zeta in Perl.Any kind of help will be appreciated.Thanks,Shiv
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What is meant 'die' in a perl program?
loginprompt
- Jun 20th, 2006
Goto end block if end block exists END{}, execute commands in end block, exit script
max1x
- May 20th, 2006
If the condition defined before the DIE statement is NOT met, the script will stop execution at that point, printing out the default error, if a custom error message is not defined.
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system "mkdir -p $temp/engl_2/wf";
}
if ( ! -s "$temp/backup_basedir" ) {
system "mkdir -p $temp/backup_basedir";
}
${pack_2}= -M "${temp}/engl_2/wf/${wf_package_name}.data";
${new_pack}= -M "${pack}/package.data";
This is a sample script of perl language.
What is the use of "-s" and "-M" in the above script? ">#create directory if not thereif ( ! -s "$temp/engl_2/wf" ) { system "mkdir -p $temp/engl_2/wf";}if ( ! -s "$temp/backup_basedir" ) { system "mkdir -p $temp/backup_basedir";}${pack_2}= -M "${temp}/engl_2/wf/${wf_package_name}.data";${new_pack}= -M "${pack}/package.data";This is a sample script of perl language.What is the use of "-s" and "-M" in the above script?
mpathak
- Dec 5th, 2007
Use File::Path;if(! -d "$DIR"){ mkpath("$DIR") || die("Could not create directory");}
vinod
- Sep 9th, 2007
-s ==> Is filename a non-empty file?-M ==> How long since filename modified?
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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 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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What's the purpose of -w.strict,-T?
Burugupalli
- Feb 11th, 2007
-T is taint mode. Taint mode makes a program more secure by keeping track of arguments which are passed from external source.
Manjusha1
- May 18th, 2006
-w option enables warning.use strict pragma is used then you should declare variables before there use.--Manjusha
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Perl Interview Questions
Ans