1. POSIX
use POSIX qw(strftime);
use constant NOW => strftime( '%Y%m%d.%H%M%S', localtime );
use constant TODAY => strftime( '%Y%m%d', localtime );
2. Data::Dumper
use Data::Dumper;
Dumper ( \%hash);
Dumper(\@array);
Data::Dumper->Dump( [\%hash], ["HASHDATA"] );
Data::Dumper->Dump( [\@array],["ARRAYDATA"]);
3. Getopt::EvaP
use GetOpt::Evap;
use constant ME => File::Basename::basename($0);
##############################
#Set up the options processing
#
my %opt = ();
my (@PDT) = split (/\n/, <<"//end-of-PDT");
PDT @{[ME]}
server, S: string
db_user, U: string = "dev"
db_pass, P: string = "developer"
db_set, D: string = "mydatabase"
ops, ops: string
log_dir, ld: file = "/tmp/test_dir/LOG"
todo_dir, td: file = "/tmp/test_dir/TODO"
done_dir, dd: file = "/tmp/test_dir/DONE"
email, e: string
PDTEND optional_file_list
//end-of-PDT
;
my (@MM) = split (/\n/, <<"//end-of-MM");
@{[ME]}: Some comments here.
.server
Server to connect to and apply the SQL.
.db_user
User name to login as.
.db_pass
Password for user.
.db_set
Destination database.
. Name of original data file from which this SQL was generated. Name
to be used in the mail message.
.log_dir
Directory where to place the generated logs.
.todo_dir
Directory where to take the todo sql file
.done_dir
Directory where to place the processed sql file
.email
Email where the results will be sent.
//end-of-MM
;
EvaP(\@PDT, \@MM, \%opt)
or die("Cannot parse arguments: \"@ARGV\" using Getopt::EvaP!");
print Dumper %opt;
4. File::Basename
use File::Basename;
use constant SCRIPT_NM => basename($0);
my $PROG =
basename($0) || die "Could not determine program name using 'basename':$?";
my $CURRDIR =dirname($0);
my $filename = "/tmp/test_dir/test.txt";
my $dir = dirname($filename);# /tmp/test_dir
my $file = basename($filename);#test.txt
my ($base, $dir, $suffix) = fileparse($filename,'.txt');
5. File::Copy
use File::Copy;
my $src_file = "/tmp/test_dir/src.xls";
my $dst_file = "/tmp/test_dir/dst.xls";
die( "Unable to move '$src_file' to '$dst_file'.")
unless move( $src_file, $dst_file );
useFile::Copy;
copy("file1","file2")or die "Copyfailed: $!";
copy("Copy.pm",\*STDOUT);
move("/dev1/fileA","/dev2/fileB");
useFile::Copy"cp";
$n = FileHandle->new("/a/file","r");
cp($n,"x")
