Perl Scripting FAQ’s

Perl is used in a mission-critical project – like the defense industry. It is also used in “Rapid Prototyping”.

Yes, we can add module file in perl and the functions that enable are “Require” “Or” and “Use”

The various Characteristics of Perl are :

• Case-sensitive
• Easy to code
• Open-source
• Portable and cross-platform.
• Extendable
• No distinction between the types of variables.
• Can return non-linear types likes arrays etc.
• Non-scalars can be used as loop indices.
• Supports high-level intrinsic operations – Example: stack Push/pop.
• Powerful text manipulation API including Regular expressions.

It is considered when it comes to importing the functions in a way that they can be accessed directly during the program. The users are free to get the results in case the substatements are not accurate. On the other side, the use statement is generally executed during parsing.

The Scalars in Perl are the variables, which are having values with linear data types like integer, float or string

$x=10;

$mystr=”abc”;

These are all scalar variables.

The Perl programming language can also be used both as a compiler and as an interpreter. It takes in the source codes and converts them into bytecode that is understandable by the programming language. We can then execute and run the program.

CPAN stands for Comprehensive Perl Archive Network and is a large collection of all the documents and software related to Perl. The programmers can access and can avoid the difficulties they face. CPAN is of significant use for the programmers and they are free to derive a lot of useful information from the same.

Assignment Operators

Arithmetic Operators

Increment operators

Comparison operators

Logical Operators

String Operators

An array can be made empty easily. For this, the value of the array is set to zero and the users can then perform this task by assigning the null list to it.

Terms have the maximum number of precedence. It generally includes expressions, quotes and the same have word precedence which is complex.

There are options –p and –n to wrap scripts in the loops. The users are free to use this option as many times as you can. There are no restrictions on the size of the scripts and the loops.

The warning messages simply let the user keep an eye on the quality of code. With the appropriate messages, it becomes simple for a user to highlight problems. The user can set the messages as optional while working on the programs.

By default, all the variables in Perl are global in scope. Which means that a variable can be used for a reminder of the program from the point of its declaration.

You can use ‘my’ keyword for a variable and this makes a variable to have local scope.

Example: my $x=10;

The interpreter in the Perl is actually free to convert simply the program into the small codes, by this we can say perl is a compiler.

Closure is defined as the block of code in Perl which is used for capturing the lexical variable which can be accessed at a later section in a program.

Numeric operators in Perl are :

Arithmetic operators (+,-,*/).

Comparison operators to compare two numbers (>, <, ==, !=,<=,>=,<=>).

Bitwise Operators(&(and), |(or),^(ex-or),~(not),<<(shift left),>>(shift right)).

Arithmetic operators perform from left to right while Bitwise operators perform an operation from right to left.

Perl scripting is regarded as one an important script programming language similar to that of C and C++ language implemented in the IT market. Perl is mainly used for network operations. The use of Perl scripting depends on the compiler and not on the interpreter. It can be mainly used for network operations, developing websites and OS programs.

Yes, we can load binary extension dynamically but your system supports that. If it doesn't support, then you can statically compile the extension.

chomp() operator removes the last character of a string and returns the number of characters removed.

chomp() operator is useful while reading input data from the console where it can be used to remove a newline (\n) character.