How often are new versions of Perl released? ... Recently, the plan has been to release a new version of Perl roughly every April, but getting the release
uc $new | (uc $1 ^ $1) . ... # finish up with any remaining new (for when new is longer than old) if ($newlen > $oldlen) {
) or system("mv", $old, $new); It may be more portable to use the File::Copy module instead. ... You just copy to the new file to the new name (checking return values), then delete the old one.
If you want to preserve the original hashes, copy one hash (%hash1) to a new hash (%new_hash), then add ... don't want to create a new hash, you can still use this looping technique; just change the %new_hash
He suggests (assuming your string is contained in $text): my @new = (); push(@new, $+) while ... | , }gx; push(@new, undef) if substr($text,-1,1) eq ','; If you want to represent quotation
local($x) saves away the old value of the global variable $x and assigns a new value for the duration ... my($x) creates a new variable that is only visible in the current subroutine.
use File::Copy; copy( $original, $new_copy ) or die "Copy failed: $!" ... You also have to remember to copy the permissions, owner, and group to the new file.
Use the Email::Folder module, like so: use Email::Folder; my $folder = Email::Folder->new('/path ... Simple objects, but we want # Email::MIME objects as they're more robust my $mime = Email::MIME->new
You have to put these directives at the beginning of the line and somewhere where Perl expects a new ... You end the comment with =cut, ending the Pod section: =pod my $object = NotGonnaHappen->new
Think of it this way: double-quote expansion is used to produce new strings. ... If you get used to writing odd things like these: print "$var"; # BAD my $new = "$old"
use Email::MIME; my $message = Email::MIME->new($rfc2822); my $subject = $message->header('Subject ... Abstract and then using its cast method to get an Email::MIME object: my $abstract = Email::Abstract->new
("H*", pack("N", 3735928559)); Using Bit::Vector: use Bit::Vector; my $vec = Bit::Vector->new_Dec ... Using Bit::Vector: my $vec = Bit::Vector->new_Bin(32, "11011110101011011011111011101111"); my
; open my $out, '>', "$file.new" or die "Can't write new file: $!" ... open my $out, '>', "$file.new" or die "Can't write new file: $!"
work using splice, randomly picking another element to swap the current element with srand; @new ... = (); @old = 1 .. 10; # just a demo while (@old) { push(@new, splice(@old, rand @old
handshaking, then the standard dual-process approach will suffice: use IO::Socket; # new ... in 5.004 my $handle = IO::Socket::INET->new('www.perl.com:80') or die "can't connect to
using the www_form_urlencode method from HTTP::Tiny: use HTTP::Tiny; my $ua = HTTP::Tiny->new ... use HTTP::Tiny; my $ua = HTTP::Tiny->new; my $url = 'https://metacpan.org/search'; my $
(contributed by Alex Beamish) If the new version of the C library is ABI-compatible (that's Application
foobarbar foobarbarbar Finally foo The $f that has "bar" added to it three times should be a new ... $f my $f should create a new lexical variable each time through the loop.
Perl News covers some of the major events in the Perl world, Perl Weekly is a weekly e-mail (and RSS
This will mean a new variable might accidentally be associated with the value for an old. ... handle renaming the keys if you use multiple threads (which causes all variables to be reallocated at new
Production releases, which incorporate bug fixes and new functionality, are widely tested before release
If you don't have a modern enough Perl installed, use the new_tmpfile class method from the IO::File ... () or die "Unable to make new temporary file: $!"
To change the file, make a new shadow password file (the format varies from system to system--see passwd
Here's an example: $person = {}; # new anonymous hash $person->{AGE} = 24
:-) If you want to override a predefined function, such as open(), then you'll have to import the new
You are probably using "main::foo" in new Perl code anyway, so this shouldn't be an issue.
lines in the file then start at the beginning and print the number of lines (minus the last N) to a new ... ; my $filename = 'test.txt'; my $Lines_to_truncate = 2; my $bw = File::ReadBackwards->new
a', 1, 'B', 3 ); # Print the current date and time and then Tommorrow my $t = Time::Piece->new ... ; say "Now is: ${\ $t->cdate() }"; say "Tomorrow: ${\ do{ my $T=Time::Piece->new + ONE_DAY ;
resources and give their content back to you as a string: use HTTP::Tiny; my $ua = HTTP::Tiny->new
all the .c files in the current directory, leaving a backup of the original data from each file in a new
circular arrays: use Array::Iterator::Circular; my $color_iterator = Array::Iterator::Circular->new
itself my $str = 'Haarlem'; # in the Netherlands $str =~ tr///cs; # Now Harlem, like in New
First, adding the new possessive + to any quantifier finds the longest match and does not backtrack. ... Second, the new (?PARNO) refers to the sub-pattern in the particular capture group given by PARNO.
; To open file for writing, create new file if needed or else truncate old file: open my $fh, ' ... ; To open file for writing, create new file, file must not exist: sysopen my $fh, $path, O_WRONLY
MakeMaker for more information (in brief, just use make perl instead of a plain make to rebuild perl with a new
filehandle you want to affect, call the Cls method: Win32::Console; my $OUT = Win32::Console->new
use File::Stream; my $stream = File::Stream->new( $filehandle, separator => qr/\
temp files: use IPC::Open3; use IO::File; my $in = ''; local *CATCHOUT = IO::File->new_tmpfile ... ; local *CATCHERR = IO::File->new_tmpfile; my $pid = open3($in, ">&CATCHOUT", ">&CATCHERR", "
If Perl is new (and thus scary) to them, find something that Perl can do to solve one of their problems
bless-able) $fh = *SOME_FH{IO}; # blessed IO::Handle from *SOME_FH typeglob Or, you can use the new ... use IO::Handle; # 5.004 or higher my $fh = IO::Handle->new(); Then use any of
If things aren't broken, upgrading perl may break them (or at least issue new warnings).
The Devel::NYTProf (New York Times Profiler) does both statement and subroutine profiling.
For more information on file locking, see also "File Locking" in perlopentut if you have it (new for
echo, $noecho, $fd_stdin); my $fd_stdin = fileno(STDIN); $term = POSIX::Termios->new
Cookbook Modules perlmod - Perl modules (packages and symbol tables) perlmodlib - constructing new
use ExtUtils::Installed; my $inst = ExtUtils::Installed->new(); my @modules = $inst->modules
d'; my $p_iterator = Algorithm::Permute->new ( \@array ); while (my @perm = $p_iterator->next
localtime() - ONE_DAY; # WRONG print "Yesterday was $yesterday\n"; The Time::Piece module exports a new
$oterm, $echo, $noecho, $fd_stdin); $fd_stdin = fileno(STDIN); $term = POSIX::Termios->new
Left and right padding with any character, creating a new string: my $padded = $pad_char x ( $pad_len
. $+[0] * 8; } Or use the CPAN module Bit::Vector: my $vector = Bit::Vector->new($num_of_bits