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Perl's original designer was Larry Wall (Larry Wall), which was published on December 18, 1987. Perl borrows the features of C, sed, awk, shell scripting, and many other programming languages. Larry Wall Published version 1.0 of the Perl scripting
I. Data Types(Data type):
Perl has four data types: Scalar (variable), Scalar Array (Array), Hash Array (Hash), and References (pointer ), it seems to be rare, but it is more than enough to use it. Especially when writing Perl programs, you do not
one. DataType (data type ):Perl's data types are roughly four: Scalar (variables), Scalar Array (array), hash array (hash), References (pointer), but they seem to be small but more than sufficient. In particular, you can write a Perl program without
Perl Arraysa Perl array is a list variable that stores scalar values, and variables can be of different types. array variables begin with @. Access array elements are read using the $ + variable name + [index value] format. 1. Creating an array1.
Reference
Common Perl Command Line options
Common unix Commands: perl implements sed awk tr nl
Perl, sed, awk, tr, grep, nl, and other common commandsSed
Task
Sed
Perl
Replace12WithTwelve
sed 's/12/twelve/g'
perl -pe '
Chapter 2: References
References are declared as scalar types (named variables starting with $), and reference is obtained using the \ operator.
Modifying the referenced variable is equivalent to modifying the reference pointing to the
Part I Programming Perl 1 Perl Data Types 1.1 Funny Characters
Type
Character
Example is
a name for:
Scalar
$
$cents
An individual value (number or string)
Array
@
@large
Incident
I rummaged over the books that spread the case. These books are all about programming and system management. After so many years of working as a programmer, there have been countless projects and software. Every new friend asks me this
PrefaceTo retrieve whether a string exists in an array, the most basic idea should be to loop through the array and judge the value of each element and the given value to be equal.(In the Java language you can also convert the array to list, in the
Advantages and disadvantages of Python and Perl, and advantages and disadvantages of pythonperl
I. Comparison between Python and Perl
(1) The initial purpose of designing a language determines the built-in functions of the language:
Perl was
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