ITTips
How to use CPAN?
CPAN install module: to install a module
How to run a bash command in a Perl program:
http://perl.about.com/od/programmingperl/qt/perlexecsystem.htm∞
system("myCommand"); i.e.: system("/bin/ls");
How to get the file size:
http://www.perlmeme.org/faqs/file_io/filesize.html∞
$size =
(-
s 'ddserver.log');
print $size;
String comparison
if ($ticketList ne '')
##ne##: non equal
##eq##: equal
Pass array to sub-routines
Here is the post I found online that helped me to solve this problem:
http://www.nntp.perl.org/group/perl.beginners/2007/11/msg96639.html∞
Normally it is not possible to pass array to sub routines.
The only way to do so is to pass a reference to the array when calling the sub-routine and then to use it in the sub-routine
WriteChangesTofile
($new_configuration_file,\
@changed_file);
sub WriteChangesTofile
{
# Does not return anything. It OVERwrites the file
my $new_configuration_file=
$_[0];
my @changed_file = @
{$_[1]};
# This is the way to handle array passed to sub-routines. The array is passed as a reference
print "Updating: ".
$new_configuration_file.
"\n";
open(NEW_CONF_FILE,
">$new_configuration_file");
print (NEW_CONF_FILE
@changed_file);
close(NEW_CONF_FILE
);
} Put some color in your life
Well, even if not in your life, at least in your script.
Reference website:
http://docstore.mik.ua/orelly/perl/cookbook/ch15_06.htm∞
use Term::
ANSIColor;
print color
("red"),
"Danger, Will Robinson!\n", color
("reset");
print color
("yellow"),
"Danger, Will Robinson!\n", color
("reset");
print color
("green"),
"Danger, Will Robinson!\n", color
("reset");
print color
("blue"),
"Danger, Will Robinson!\n", color
("reset");
Proper way to do a for loop
Do not ask me why though ...
for (; $i < $arraySize ; $i++ ) {
}
The way each behaves ...
http://www.cs.mcgill.ca/~abatko/computers/programming/perl/howto/hash/∞:
- Use each within a while loop. Note that each iterates over entries in an apparently random order, but that order is guaranteed to be the same for the functions keys and values.
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