Re: Converting to capital only one word in a line
The backslash escapes the character following it. Oh, that's right. Sorry. Using scalar() there is redundant as the expression is already in scalar context. Also using scalar(@split_home) - 1 will not work correctly if the value of $[ has been changed. What exactly *is* $[? It has been confusing me for some time. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Converting to capital only one word in a line
my @split_line = split(/\:/, $line); my $home = $split_line[5]; my @split_home = split(/\/, $home); return uc($split_home[scalar(@split_home) - 1]); On 1/11/07, Emilio Casbas [EMAIL PROTECTED] wrote: I know that this is not a exact perl question, but maybe someone has a perl solution. You have the passwd file such this: test:x:593:501::/usr/local/etc5/test:/bin/bash and you have to convert it to: test:x:593:501::/usr/local/etc5/TEST:/bin/bash Only converting to capital letter the last part of the home directory. Anyone have some way to achieve it? Regards. Emilio C. -- -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Converting to capital only one word in a line
You don't have to escape the colon in a regular expression. Oh, cool. Didn't know that. my $home = $split_line[5]; my @split_home = split(/\/, $home); ^^^ Syntax error. The terminating delimiter is missing. I am confused. What do you mean, the terminating delimter is missing? It seems alright to me... scalar(@split_home) - 1 could also be written as $#split_home or just -1. I did not know that ``-1'' would work. However, I prefer scalar() to $#. There is More than One Way to Do It! :-) -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Negate a regular expression
!~ will return true if the thing on the right does not match. In your case, however, using unless seems more logical. Something like exit unless (lc($answer) =~ /^[y|yes]$/) should work. The ^ and $ are there to make sure that the string contains nothing but ``y'' or ``yes''. Make sure that you do chomp($answer) before running this, though, because the newline character may break it. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Strings vs Arrays
To push something to an array:
push(@array, $data);
To push something onto a scalar:
$scalar = $scalar . $data;
-or-
$scalar .= $data;
The better method depends entirely on what you intend to do with the
data and how you have it. It is also very easy to both split a string
into an array,
@array = split(/pattern_to_split_over/, $string); # note that the
pattern can just be //, to split every character into its own element
of the array
and to make an array into a string:
foreach (@array) { $string .= $_; }
One thing to note, though, is that array operations in Perl (push(),
splice(), etc.) are wicked fast.
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Modifying a PNG File
Hello, Is there a (relatively simple) way to modify an image in Perl? Ideally, this would be a PNG or GIF image. I just need to be able to modify the colors of specific pixels. Thanks in advance! -- Leonid Grinberg [EMAIL PROTECTED] -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Passing a hash to a function
Hello all,
I have a question about passing a hash to a fucntion. Suppose you had
the following script:
sub function
{
my %operating_systems = populate_hash(%operating_systems);
do_something_with_hash();
}
sub populate_hash
{
my %operating_systems = ?;
$operating_systems{microsoft} = Windows;
$operating_systems{apple} = Macintosh;
...
return %operating_systems;
}
What should the ? be? If it was an array, it would be @_; if it
was a scalar, it would be
my ($scalar) = @_, $_[0], or shift; How about with a hash?
Thank you in advance!
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Re: Perl OS system equivalence or Perl scripts for UNIX-and-Windows
Yes, as people have mentioned your options are: -Run the scripts with Cygwin, which will ensure that most system commands will be set up for you (if this is for general distribution, you can make it a system requirement, although that's a pretty heave system requirement to have). -Rewrite the UNIX commands yourself (or use those that others created already). Many of them are fairly easy to recreate, but some are more difficult. Obviously, rewriting Vi in Perl is stupid, but you can quite easily do things like ls, rm, etc. -- Leonid Grinberg [EMAIL PROTECTED] http://www.lgrinberg.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: What are the most successful applications of Perl? Thanks.
SLASHDOT!!! Amazing that this has not yet been mentioned! -- Leonid Grinberg [EMAIL PROTECTED] http://www.lgrinberg.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: Hi
I am a novice to perl,I would like to learn perl in a systematic way, Whats the best way to start with,I dont have any experience of programming Language, But I came to know that perl is a Good Programming Language Whether or not you do choose to use a book or not, remember: always try doing some excersizes. You *cannot* just read, you have to try it firsthand. This is as simple as writing your first program that just prints out ``Hello World'' to testing out the ugliest regular expressions (you will eventually learn what these are). Remember, you are just learning, and so you are free to experiment. Good Luck! -- Leonid Grinberg [EMAIL PROTECTED] http://www.lgrinberg.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: General Perl/Web questions
Yeah, what that would pretty much mean is that you will make a file
called, say, CommonFuncts.pm and then in each Perl script say
use CommonFuncts;
Alternatively, you can make a common_functs.pl file, where each one of
the above actions is performed in a subroutine (the file should only
have subroutines, and should not do anything outside of them (except
like use strict;)) and then, from within each file, you could do
something like
BEGIN
{
do ('common_functs.pl');
die if $@;
}
The BEGIN just makes the block be loaded at the beginning of
execution, the do() function loads files and eval()s them (except
since all we have are subroutines, nothing is actually performed, you
just now have all of the new subroutines to work with) and the 'die if
$@' exits if there were syntax errors in the common_functs.pl file and
it prints them.
Either of the two ways work, I just prefer do();
Cheers!
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