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Perl was initially named "Pearl". Wall wanted to give the language a short name with positive connotations; he claims that he considered (and rejected) every three- and four-letter word in the dictionary. He also considered naming it after his wife Gloria. Wall discovered the existing PEARL programming language before Perl's official release and changed the spelling of the name.

When mentioning to the language, the name is normally capitalized (Perl) as a proper noun. When referring to the interpreter program itself, the name is often uncapitalized (perl) because most Unix-like file systems are case-sensitive. Before the release of the first edition of Programming Perl, it was common to refer to the language as perl; Randal L. Schwartz, however, capitalized the language's name in the book to make it stand out better when typeset. This case distinction was subsequently documented as canonical.

There is some contention about the all-caps spelling "PERL", which the documentation declares incorrect and which some core community members consider a sign of outsiders. The name is occasionally backronymed as Practical Extraction and Report Language, which appears at the top of the documentation and in some printed literature.

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Basic example of PERL programming is as follows :

PERL PROGRAMMING EXAMPLE -------------

HTML FILE DISPLAY
#
# This translates a file, such a program or other text file, so that
# it can be displayed literally in HTML. It brackets the code in
# the <pre> and </pre> tags, expands tabs, and translates the characters
# which HTML treats as special so they will be displayed literally.
#

use strict;

#
# Expand tabs at 8 stops per tab.
#
sub expand {
my ($line) = @_;
my ($left, $right); # Parens needed so my applies to both.

while($line =~ /\t/) {
($left, $right) = split (/\t/, $line, 2);

my($tabamt) = 8 - length($left) % 8;
$line = $left . (" " x $tabamt) . $right;
}

return $line;
}

print "<pre>\n";

# Copy with changes.
while(my $line = <STDIN>) {
chomp $line;

$line = expand($line);

$line =~ s/&/&amp;/g;
$line =~ s/</&lt;/g;
$line =~ s/>/&gt;/g;
$line =~ s/"/&quot;/g;

print "$line\n";
}

print "</pre>\n";

 

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