hi,
i'm using a perl script i found to change the names of batches of
files. The program works as is but it's giving me a weird warning.
I'm familiar with $_, but not $_[3]. Can someone explain what $_[3]
is, and how i can get this script to stop throwning the warning?
Thanks,
Ryan
i found
On 9/18/07, Ryan Moszynski [EMAIL PROTECTED] wrote:
i'm using a perl script i found to change the names of batches of
files. The program works as is but it's giving me a weird warning.
I'm familiar with $_, but not $_[3]. Can someone explain what $_[3]
is, and how i can get this script to
in it as $_[0], the second parameter as $_[1]
and so on. And you can refer to $_# as the index number of the last
parameter:
-Original Message-
From: Ryan Moszynski [mailto:[EMAIL PROTECTED]
Sent: 18 September 2007 15:12
To: beginners@perl.org
Subject: perl default variable
:-)
$_ is basically the first variable of @_ which is the array that Perl is
currently working on.
So when your script is complaining about something in $_[3] what it is
saying is that the 4th variable (Perl starts counting at 0) in the @_ array
is making the compiler unhappy.
I hope this helps
Ryan Moszynski wrote:
hi,
Hello,
i'm using a perl script i found
You should be careful with stuff you find lying around.
to change the names of batches of
files. The program works as is but it's giving me a weird warning.
I'm familiar with $_, but not $_[3]. Can someone explain what
Friends:
I have an outerloop with a list and so do I have an
inner loop with another list.
$_ variable points to list in the outer-loop or
inner-loop depending upon the scope. I prefer to not
use aliases. In such a case, when I am in the scope of
inner loop, can I access the looping variable on
Friends:
I have an outerloop with a list and so do I have an
inner loop with another list.
$_ variable points to list in the outer-loop or
inner-loop depending upon the scope. I prefer to not
use aliases. In such a case, when I am in the scope of
inner loop, can I access the looping variable on
: Monday, September 09, 2002 2:33 PM
To: [EMAIL PROTECTED]
Subject: $_ variable question
Friends:
I have an outerloop with a list and so do I have an
inner loop with another list.
$_ variable points to list in the outer-loop or
inner-loop depending upon the scope. I prefer to not
use aliases
Note: forwarded message attached.
__
Do You Yahoo!?
Yahoo! Finance - Get real-time stock quotes
http://finance.yahoo.com
---BeginMessage---
Tim -- Thanks for your rejoinder.
Mostly, I do use 'aliased' variables within nested
loops. However,
On Mon, Sep 09, 2002 at 02:29:24PM -0700, RTO RTO wrote:
$_ variable points to list in the outer-loop or
inner-loop depending upon the scope. I prefer to not
use aliases. In such a case, when I am in the scope of
inner loop, can I access the looping variable on the
outer without using an
Michael -- As I had earlier posited, it was just out of curiosity and the question was
more in tune with academic curiosity rather than pragmatic correctiveness.
I always used to have named iterators, but when I was programming without them
today, this question came up to my mind
AM
To: [EMAIL PROTECTED]
Subject: Object oriented variable question
When using cgi.pm object oriented method, how do I assign a static value to
a variable and then output it? The test script that I listed below prints
all of the html tags with Hello!Did it work? (without the quotes
Hi everyone.
I was wondering how you would determine whether a variable is a number or not. I want
to do an if statement such as
if ($variable is a number) {...
Any help is great. Thanx,
Helen
-
Find, Connect, Date! Yahoo! Canada Personals
On Wed, Apr 17, 2002 at 02:44:32PM -0400, Helen Dynah wrote:
I was wondering how you would determine whether a variable is a number or
not.
Use a regex, see perldoc -q 'is a number' or
http://www.perldoc.com/perl5.6.1/pod/perlfaq4.html, second question in the
Data: Misc section.
Michael
--
:45 AM
To: [EMAIL PROTECTED]
Subject: Variable question
Hi everyone.
I was wondering how you would determine whether a variable is a number or
not. I want to do an if statement such as
if ($variable is a number) {...
Any help is great. Thanx,
Helen
On Wed, 2002-04-10 at 11:10, Randal L. Schwartz wrote:
Bob == Bob Ackerman [EMAIL PROTECTED] writes:
At no point do you have an array in a scalar context, or a list
in a scalar context. Really. You don't. Ever. Get it?
And why I'm harping on this is that I've seen this myth
Bob == Bob Ackerman [EMAIL PROTECTED] writes:
At no point do you have an array in a scalar context, or a list
in a scalar context. Really. You don't. Ever. Get it?
And why I'm harping on this is that I've seen this myth continue to
perpetuate, started from some bad verbage or bad
I believe it is as simple as:
$count = () = $string =~ /,/g;
I can't seem to get my brain around what's happening here... would
someone be kind enough to explain?
-dave
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
On Monday, April 8, 2002, at 06:24 AM, David Gray wrote:
I believe it is as simple as:
$count = () = $string =~ /,/g;
I can't seem to get my brain around what's happening here... would
someone be kind enough to explain?
-dave
$string =~ /,/g;
that finds all occurrences of comma in
On Mon, 2002-04-08 at 12:00, bob ackerman wrote:
On Monday, April 8, 2002, at 06:24 AM, David Gray wrote:
I believe it is as simple as:
$count = () = $string =~ /,/g;
I can't seem to get my brain around what's happening here... would
someone be kind enough to explain?
-dave
On Monday, April 8, 2002, at 10:40 AM, Chas Owens wrote:
On Mon, 2002-04-08 at 12:00, bob ackerman wrote:
On Monday, April 8, 2002, at 06:24 AM, David Gray wrote:
I believe it is as simple as:
$count = () = $string =~ /,/g;
I can't seem to get my brain around what's happening here...
On Mon, 2002-04-08 at 14:37, Randal L. Schwartz wrote:
Chas == Chas Owens [EMAIL PROTECTED] writes:
There is no meaning for list in a scalar context, so your statement
makes no sense.
Chas my $some_scalar = () = /\s/g;
Chas I emphasize again, that is how I _read_ it. I know that
$count = () = $string =~ /,/g;
$string =~ /,/g;
assigns the result in a list context - the anonymous list '()'. by
assigning this to a scalar, $count, we get a value that is
the size
of the list, which is the number of matches that the regex
made. that
empty list thingy is
Chas == Chas Owens [EMAIL PROTECTED] writes:
Chas With the downside that you have an array that you never use. Using ()
Chas to force list context is one of those strange little quirks that you
Chas just get used to. These days I read () as the array equivalent of
Chas scalar().
Well, there
On Monday, April 8, 2002, at 12:15 PM, Randal L. Schwartz wrote:
Chas == Chas Owens [EMAIL PROTECTED] writes:
Chas I emphasize again, that is how I _read_ it. I know that there is no
Chas array() and I know why, but that doesn't change how I read things.
This
Chas hack forces the far
Chas == Chas Owens [EMAIL PROTECTED] writes:
There is no meaning for list in a scalar context, so your statement
makes no sense.
Chas my $some_scalar = () = /\s/g;
Chas I emphasize again, that is how I _read_ it. I know that there is no
Chas array() and I know why, but that doesn't change
On Sat, Apr 06, 2002 at 11:32:01PM -0800, John W. Krahn wrote:
And if you really want to get cute you can put it all on one line:
substr( $ARGV[0], $_, 1 ) eq $ARGV[1] and $cnt++ for 0 .. length(
$ARGV[0] ) - 1;
print $cnt;
I count two lines ;-)
Both of these are a little obfuscated, but
PROTECTED]
Subject: Variable question
Hi everybody. I am a new user and my first question to this list is
probably a very simple one. I am trying to count the number of commas
in a variable. The book I am learning from doesn't cover specific
information like that. Thanks for any help
Aman Cgiperl wrote:
Execute the following on cmd line as follows
$./cnt.pl string ,
You can replace the comma (,) on the command line to find any other
character's occurrence in the string
___
#!/usr/bin/perl
for(;$ilength($ARGV[0]);$i++) {
$str[i] =
Hi everybody. I am a new user and my first question to this list is probably a very
simple one. I am trying to count the number of commas in a variable. The book I am
learning from doesn't cover specific information like that. Thanks for any help.
Helen
were in the string.
my $string = a,b,c;
my $num = $string =~ tr/,//;
print $num;
prints 2.
- Original Message -
From: Helen Dynah [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, April 05, 2002 12:52 PM
Subject: Variable question
Hi everybody. I am a new user and my first question
Just for the sake of argument, you can also do it using the /g switch of
m//.
while($string =~ /,/g){
$num++;
}
-Original Message-
From: Tanton Gibbs [mailto:[EMAIL PROTECTED]]
Sent: Friday, April 05, 2002 10:06 AM
To: Helen Dynah; [EMAIL PROTECTED]
Subject: Re: Variable question
($string =~ /,/g){
$num++;
}
-Original Message-
From: Tanton Gibbs [mailto:[EMAIL PROTECTED]]
Sent: Friday, April 05, 2002 10:06 AM
To: Helen Dynah; [EMAIL PROTECTED]
Subject: Re: Variable question
The tr operator will translate one character to another. For example:
my
On Fri, 2002-04-05 at 13:46, bob ackerman wrote:
or, to continue to discussion:
@s = $string =~ /,/g;
print scalar @s,\n;
i don't know how to get count directly assigned to variable. someone?
snip /
I believe it is as simple as:
$count = () = $string =~ /,/g;
--
Today is Setting
Thanks everyone for all the help. The suggestions worked great.
Helen
Note: forwarded message attached. Music, Movies, Sports, Games! Yahoo! Canada Entertainment---BeginMessage---
Hi everybody. I am a new user and my first question to this list is probably a very
simple one. I am trying to
--- Hitesh Ray [EMAIL PROTECTED] wrote:
I am required to modify an Environment variable from one value to
another using perl script. I can access the env. variables in the
perl
script using ENV. How can i modify so that when I exit my perl script
-- the env. variable has new value.
That's a
I am trying to get [one program to pass some
info to another]
There's many ways to skin that cat!
(Apologies to my four cats).
I suggest creating a file which contains the directory name.
37 matches
Mail list logo
