Perl Cheat Sheet
LWP
File download
use LWP::Simple;
getstore("http://ftp.server.com/data/file.zip", "c:\\file.zip.zip");
Manip
DateCalc
use Date::Manip;
$bla=&UnixDate(DateCalc("2013-05-31","+ 1 days",\$err),"%Y-%m-%d")
my $pageDate = "201402190000";
$pageDate = UnixDate("$pageDate","%A %d %B %Y %H:%M");
print "$pageDate";
Array
Return array from function
#!/usr/bin/perl
use strict;
use Data::Dumper;
my @ret=&retTest;
print "=>$ret[0]\n";
print "=>$ret[1]\n";
sub retTest {
my @subRet;
@subRet=("a","b");
return @subRet;
}
Hash
Double nested
Double nested sample,
for( @{$_->{FaresResponsePassenger}} ){
Experts Exchange
I got the following hash by a soap response, example:
$VAR1 = {
'Response' => {
'Category' => [
{
'ID' => '12345',
'Articel' => {
'Segment' => [
{
'Number' => '1',
},
{
'Number' => '2',
}
]
}
},
{
'ID' => '6789',
'Articel' => {
'Segment' => [
{
'Number' => '1',
},
{
'Number' => '2',
}
]
}
}
]
},
};
my $n=0;
$n += grep$_->{Number},@{$_->{Articel}{Segment}} for @{$VAR1->{Response}{Category}};
ExpertsExchange-1
This is a follow up question from ID 25120698. I got the following hash by a soap response, example:
$VAR1 = {
'Response' => {
'Category' => [
{
'ID' => '123',
'Articel' => {
'Segment' => [
{
'Number' => '1',
},
{
'Number' => '2',
}
]
}
},
{
'ID' => '456',
'Articel' => {
'Segment' => [
{
'Number' => '3',
},
{
'Number' => '4',
}
]
}
},
{
'ID' => '789',
'Articel' => {
'Segment' => {
'Number' => '5',
}
}
}
]
},
};
you can check the ref is ARRAY or HASH and depend on which you can print it.
for my $v (@{$VAR1->{Response}{Category}}){
if(ref($v->{Articel}{Segment}) eq "ARRAY"){ ### Check it is ARRAy or HASH
for my $w (@{$v->{Articel}{Segment}}){
print "$w->{Number}\n";
}
} else {
for my $w (keys (%{$v->{Articel}{Segment}})){ ###Get the element as HASH ref and print
print "$v->{Articel}{Segment}{$w}\n";
}
}
}
Another sample:
$w contains this:
$VAR1 = [
{
'value' => {
'text' => 'auto_generated_pool_enterprise'
},
'k' => 'Pool'
},
{
'k' => 'used',
'value' => {
'text' => '43.98'
}
}
];
Want 43.98
for my $x ( @{$w}){
if ($x->{'value'}->{'text'} !~ /auto/) {
print $x->{'value'}->{'text'} . "\n";
}
}
EE3
Hi i'm looking for a regex to split the filename from a path, eg $_ = '/path/to/my//file/space /my music - name.mp3';
how do i get the filename (my music - name.mp3) and the path (/path/to/my//file/space /) into a variable, i'm trying to do something like $MP3= '/path/to/my//file/space /my music - name.mp3'; ($var,$value) = split(/\/([^.]*)/ig,$MP3,2);
i'm lost, any idea ?
thx
$_ = '/path/to/my//file/space /my music - name.mp3'; my ($var,$value) = /^(.*\/)(.*)$/;
FILE STAT
Get the mod date of a file
use File::stat qw(:FIELDS); my $stat = stat($_) or die "No File :$!"; #PS: So behandelt man Filstats! $tmpsize = $st_size; $tmpmod = $st_mtime;
Sort
Sort scalar
@splunkfiles = sort {$b cmp $a} @splunkfiles;
Close DB Handle
$sql->finish; #Close DB Handle
Socket receive
#Thanks! #http://stackoverflow.com/questions/14444539/perl-client-socket-recv-vs-when-server-socket-is-invoking-send-multiple-ti my $buf; do { defined $socket->recv($buf, 8129) or die "recv: $!"; #print qq(received: "$buf"\n); $RecData.=$buf; } while ($buf !~ /~~/);
Console autoflush
#Use autoflush with STDOUT: local $| = 1; # Or use IO::Handle; STDOUT->autoflush;
ISO8601 Dates
ISO 8601 Date to Unix
#https://metacpan.org/pod/DateTime::Format::ISO8601 use DateTime::Format::ISO8601; my $dt = DateTime::Format::ISO8601->parse_datetime('2019-02-14T00:00:00'); print $dt->strftime('%F %T') . "\n"; print $dt->strftime('%F') . "\n"; print $dt->strftime('%a') . "\n"; print $dt->strftime('%T') . "\n";
Returns:
2019-02-14 00:00:00 2019-02-14 Thu 00:00:00 560 09:20:00
ISO 8601 Duration to Minutes
#https://metacpan.org/pod/DateTime::Format::Duration::ISO8601a use DateTime::Format::Duration::ISO8601; my $format = DateTime::Format::Duration::ISO8601->new; my $d = $format->parse_duration('PT9H20M'); print $d->in_units('minutes'); # => 61
Format Duration
use DateTime::Format::Duration;
my $duration = DateTime::Duration->new(minutes => 560);
my $formatter = DateTime::Format::Duration->new(
pattern => "%H:%M:%S",
normalize => 1,
);
$duration=$formatter->format_duration($duration);
print "\n$duration\n";
Epoch TIme
use Date::Manip;
my $tEpoche=UnixDate('2018-03-30 10:00:00' ,"%s");
Timezones
- See: https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations
- See: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
Get Timezoe with short name abbreviation and offset
use DateTime;
use DateTime::TimeZone;
my $tz = DateTime::TimeZone->new( name => 'Europe/Berlin' );
$dt = DateTime->new( {
year => 2014, month => 12, day => 19,
hour => 2, minute=> 2, second=> 0
};
my $offset = $tz->offset_for_datetime($dt);
my $sn = $tz->short_name_for_datetime( $dt );
print "$dt $offset $sn\n";
Returns:
2014-12-19T02:02:00 3600 CET
use DateTime;
use DateTime::TimeZone;
my $tz = DateTime::TimeZone->new( name => 'Europe/Berlin' );
$dt = DateTime->new( {
year => 2014, month => 10, day => 19,
hour => 2, minute=> 2, second=> 0
};
my $offset = $tz->offset_for_datetime($dt);
my $sn = $tz->short_name_for_datetime( $dt );
print "$dt $offset $sn\n";
Returns:
2014-10-19T02:02:00 7200 CEST
Convert to GMT
$datestring = strftime "%x %T", gmtime; print "GMT date and time $datestring\n";
Convert to GMT to CEST
my $datex = UnixDate( Date_ConvTZ( $datestring, 'GMT', 'CEST' ), "%Y-%m-%d %T"); print "Convert GMT to CST - $datestring - $datex\n";
DBI
Return entire row from a sql statement
my $sth = $dbh->prepare('select * from sys.dm_qn_subscriptions');
$sth->execute;
while ( my @row = $sth->fetchrow_array ) {
print "@row\n";
}
Options/Arguments
use Getopt::Long; GetOptions ( "flag!" => \$flag, "string=s" => \$string, "int=i" => \$integer ); print "($flag,$string,$integer)\n";
Simple read file
open(FH, '<', '/path/file') or die "Unable to open file, $!";
while (<FH>) {
chomp;
print "$_\n";
}
close FH;