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Perl Scripting FAQ's

Wednesday, August 6, 2008. Logical operators are such things as OR, NOT, AND. They all evaluate expressions. The expression evaluates to true, or false. Exactly what criteria for evaluation are used depends on the operator. The or operator works as follows:. Open STUFF, $stuff or die "Cannot open $stuff for read :$! This line means - if the operation for opening STUFF fails, then do something else. Another example:. R/ or print "Doesn't start with R n";. Precedence: What comes First. Perl -e"print 2 8.

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Wednesday, August 6, 2008. Logical operators are such things as OR, NOT, AND. They all evaluate expressions. The expression evaluates to true, or false. Exactly what criteria for evaluation are used depends on the operator. The or operator works as follows:. Open STUFF, $stuff or die Cannot open $stuff for read :$! This line means - if the operation for opening STUFF fails, then do something else. Another example:. R/ or print Doesn't start with R n;. Precedence: What comes First. Perl -eprint 2 8.

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Perl Scripting FAQ's | perlfaq.blogspot.com Reviews

https://perlfaq.blogspot.com

Wednesday, August 6, 2008. Logical operators are such things as OR, NOT, AND. They all evaluate expressions. The expression evaluates to true, or false. Exactly what criteria for evaluation are used depends on the operator. The or operator works as follows:. Open STUFF, $stuff or die "Cannot open $stuff for read :$! This line means - if the operation for opening STUFF fails, then do something else. Another example:. R/ or print "Doesn't start with R n";. Precedence: What comes First. Perl -e"print 2 8.

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Perl Scripting FAQ's: Sorting

http://perlfaq.blogspot.com/2008/08/sorting.html

Wednesday, August 6, 2008. If I was reading this I'd be wondering about sorting. Wonder no more, and behold:. Foreach (sort keys %countries) {. Print "The key $ contains $countries{$ } n";. Spot the difference. Yes, sort crept in there. If you want the list sorted backwards, some cunning is called for. This is suitably foxy:. Foreach (reverse sort keys %countries) {. Print "The key $ contains $countries{$ } n";. Perl is just so difficult at times, don't you think? Keys returns a list. Countries=('976','M...

2

Perl Scripting FAQ's: Oneliners

http://perlfaq.blogspot.com/2008/08/oneliners.html

Wednesday, August 6, 2008. You'll have noticed Perl packs a lot of power into a small amount of code. You can feed Perl code directly on the command line. This is known as a oneliner, for obvious reasons. An example:. Perl -e"for (55.75) { print chr($ ) }". The -e switch tells Perl that a command is following. The command must be enclosed in doublequotes, not singles as on Unix. The command itself in this case simply prints the ASCII code for the number 55 to 75 inclusive. Print if / [bv]/i}" shop.txt.

3

Perl Scripting FAQ's: Modules

http://perlfaq.blogspot.com/2008/08/modules.html

Wednesday, August 6, 2008. Subroutines are oft-used pieces of code. They exist so you can re-use the code and not have to constantly rewrite it. Aside from the many modules included with Perl there are hundreds more available on CPAN, the Comprehensive Perl Archive Network. Refer to your documentation for details. File: Find - using a module. An example of a module included with Perl is File: Find. There are several modules under the File: Find section, such as File: Basetree, File: Compare and File:...

4

Perl Scripting FAQ's: Arrays

http://perlfaq.blogspot.com/2008/08/arrays.html

Wednesday, August 6, 2008. Lists, herds - what are arrays? Perl has two types of array, associative arrays (hashes) and arrays. Both types are lists. A list is just a collection of variables referred to as the collection, not as individual elements. Certain types of lists are known by certain names. Just as a herd of sheep is called a flock, a herd of lions is called a pride, a herd of wolves is called a pack and a herd of managers a confusion, some types of Perl list have a special names. I usually lear...

5

Perl Scripting FAQ's: Subroutines and Parameters

http://perlfaq.blogspot.com/2008/08/subroutines-and-parameters.html

Wednesday, August 6, 2008. In Perl, subroutines are functions are subroutines. If you like, a subroutine is a user defined function. It's a bit like calling a script a program, or a program a script. For the purposes of this tutorial we'll refer to functions as subroutines, except when we call them functions. Hope that's made the point. What we need in order to calculate the distance we can fly is:. How high we are (in feet). Obviously input is needed. We can either prompt the user or grab the input ...

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Useful WebSite Links Directory: Scripting Languages

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Useful WebSite Links Directory. Thursday, November 20, 2008. All scripting Job Interviews. Perl Scripting Job Interviewss. TCL Programming Job Interviews s. Posted bysandy at 8:02 AM. Subscribe to: Post Comments (Atom). Others Misceleneous Web Sites. Technology And Programming Blogs. Technology And Financial Articles. Microsoft .Net Faqs, Tutorials and Interview Ques. VC - Visual C Faqs, Tutorials and interview . Graphics, Awt, Swing. Windows XP System Tips. Internet and Computer Tips.

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perlfaq.blogspot.com

Perl Scripting FAQ's

Wednesday, August 6, 2008. Logical operators are such things as OR, NOT, AND. They all evaluate expressions. The expression evaluates to true, or false. Exactly what criteria for evaluation are used depends on the operator. The or operator works as follows:. Open STUFF, $stuff or die "Cannot open $stuff for read :$! This line means - if the operation for opening STUFF fails, then do something else. Another example:. R/ or print "Doesn't start with R n";. Precedence: What comes First. Perl -e"print 2 8.

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