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Symbolic Reference in PERL
What is the Use of Symbolic Reference in PERL?
imavasu
- May 3rd, 2008
> $name = "bam";> $$name = 1; # Sets $bam> ${$name} = 2; # Sets $bam> ${$name x 2} = 3; # Sets $bambam> $name->[0] = 4; # Sets $bam[0]symbolic reference means using a string as a reference.
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What is eval in perl?
sapam
- Apr 1st, 2008
The eval function provides a very simple way of checking certain events without affecting the overall execution of your script. In essence, the eval function just initiates a new instance of the Perl ...
acraul7
- Mar 5th, 2008
Eval is also used for evaluating expressions.For eg:$a = 1;$b = 3;$c = '$a*$b';print(eval "$c"); // This prints 3
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What are advantages of Perl over C, and of C over Perl ?
sapam
- Apr 1st, 2008
Advantages of PERL over C1) Perl runs on all platforms and is far more portable than C. 2) Perl and a huge collection of Perl Modules are free software (either GNU General Public License or Artist...
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When would you not use Perl for a project?
prabhasgupte
- Feb 12th, 2008
Perl programs are generally used for: - text processsing - text mining - test automation - simple network programming (simple sockets, just fetching webpage and parsing ...
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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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How we can navigate the XML documents?
we can use the XML:DOM naviation methods to navigate though an XML::DOM node tree and then use getnodevalue to recover the data.
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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'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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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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