1. What is Perl?
Perl is the abbreviation of Practical Extraction and Report Language. It is designed by Larry Wall and is constantly updated and maintained by him for programming in UNIX environments.
Perl has the powerful capabilities and flexibility of high-level languages (such as C). In fact, you will see that many of its features are borrowed from C.
Like scripting languages, Perl does not need a compiler or linker to run the code. All you have to do is write out the program and tell Perl to run it. This means that Perl is ideal for quick solutions to small programming problems and for prototypes for large events to test potential solutions.
Perl provides all the functions of scripting languages (such as sed and awk), and also has many functions that they do not have. Perl also supports sed to Perl and awd to Perl translators.
In short, Perl is as powerful as C and as convenient as script description languages such as awk and sed.
2. Where is Perl?
Perl is usually located in /usr/local/bin/perl or /usr/bin/perl. You can get it for free on the Internet with anonymous FTP, such as ftp:///pub/gnu/perl-5.
The installation process is:
(1) Unzip:
$gunzip perl-5.
$tar xvf - <perl-5.
(2) Compilation:
$make makefile
(3) Placement:
Copy the compiled executable file to the directory where the executable file is usually located, such as:
$copy <compiled excutable file> /usr/local/bin/perl
Note: This requires system administrator permissions.
3. Operation
Edit your Perl program with a text editor, and add the executable attribute: $chmod +x <program> and you can execute: $./<program>. If the system prompts: "/usr/local/bin/perl not found", it means that you have not installed successfully, please reinstall.
Note: The first line of your program must be #!/usr/local/bin/perl (where perl is located).
4. Comments:
The comment method is to use the character # at the beginning of the statement, such as:
# this line is a comment
Note: It is recommended to use comments frequently to make your program readable, which is a good programming habit.
Perl is the abbreviation of Practical Extraction and Report Language. It is designed by Larry Wall and is constantly updated and maintained by him for programming in UNIX environments.
Perl has the powerful capabilities and flexibility of high-level languages (such as C). In fact, you will see that many of its features are borrowed from C.
Like scripting languages, Perl does not need a compiler or linker to run the code. All you have to do is write out the program and tell Perl to run it. This means that Perl is ideal for quick solutions to small programming problems and for prototypes for large events to test potential solutions.
Perl provides all the functions of scripting languages (such as sed and awk), and also has many functions that they do not have. Perl also supports sed to Perl and awd to Perl translators.
In short, Perl is as powerful as C and as convenient as script description languages such as awk and sed.
2. Where is Perl?
Perl is usually located in /usr/local/bin/perl or /usr/bin/perl. You can get it for free on the Internet with anonymous FTP, such as ftp:///pub/gnu/perl-5.
The installation process is:
(1) Unzip:
$gunzip perl-5.
$tar xvf - <perl-5.
(2) Compilation:
$make makefile
(3) Placement:
Copy the compiled executable file to the directory where the executable file is usually located, such as:
$copy <compiled excutable file> /usr/local/bin/perl
Note: This requires system administrator permissions.
North America
| address | Table of contents |
| IP address: 192.94.48.152 Directory /pub/outgoing/perl5.0 |
|
| IP address: 128.227.100.198 Directory /pub/perl/src/5.0 |
|
| IP address: 192.48.96.9 Directory /languages/perl |
|
| IP address: 198.59.155.28 Directory /pub/perl |
|
| IP address: 165.95.1.3 Directory /pub/duff/Perl |
|
| IP address: 192.245.137.1 Directory /pub/perl/sources |
|
| IP address: 128.91.200.37 Directory /perl5 |
Europe
| Site | Location |
| IP address: 131.211.80.17 Directory /pub/PERL/perl5.0/src |
|
| IP address: 128.214.248.6 Directory /pub/languages/perl/ports/perl5 |
|
| IP address: 130.149.4.40 Directory /pub/unix/perl |
|
| IP address: 146.169.17.5 Directory /packages/perl5 |
Australia
| Site | Location |
| IP address: 128.250.209.2 Directory /pub/perl/src/5.0 |
South America
| Site | Location |
| IP address: 146.83.198.3 Directory /pub/gnu |
Edit your Perl program with a text editor, and add the executable attribute: $chmod +x <program> and you can execute: $./<program>. If the system prompts: "/usr/local/bin/perl not found", it means that you have not installed successfully, please reinstall.
Note: The first line of your program must be #!/usr/local/bin/perl (where perl is located).
4. Comments:
The comment method is to use the character # at the beginning of the statement, such as:
# this line is a comment
Note: It is recommended to use comments frequently to make your program readable, which is a good programming habit.