Gossamer Forum: General: Perl Programming: chop and chomp -- wt?'s new line character???

Jul 10, 2003, 11:18 PM

Malik

Novice (15 posts)

Jul 10, 2003, 11:18 PM

Post #1 of 14

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chop and chomp -- wt?'s new line character???

chop, chomp, chop, chomp, and chop, chomp??? Mad

Ok, i understand, 'chop' and 'chomp' are used to remove the newline character, but what exactly is this 'newline character'???

Can anybody please gimme a clear explanation on that? I'll be really thankrul to u.

Jul 11, 2003, 1:42 AM

Andy

Veteran / Moderator (18436 posts)

Jul 11, 2003, 1:42 AM

Post #2 of 14

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Re: [Malik] chop and chomp -- wt?'s new line character??? In reply to

A newline charachter is something like \t or \n. Basically, it means that a newline would be inserted into the output. Here are some example scripts;

Code:
#!/usr/bin/perl 

$var = qq| 

this 
is  
my test 
variables 

|; 

$var =~ s/[\t\n]/g; 

# $var now holds; 
# thisismytestvariables 
# All the newlines have been removed....

Hope that helps Smile

Cheers

Andy (mod)
andy@ultranerds.co.uk

Jul 11, 2003, 2:09 AM

Paul

Veteran (19537 posts)

Jul 11, 2003, 2:09 AM

Post #3 of 14

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Re: [Andy] chop and chomp -- wt?'s new line character??? In reply to

Eh?....\t is a tab, not a newline Wink

Also your example didn't even use chomp (and contains syntax errors) Sly

Last edited by:

Paul: Jul 11, 2003, 2:12 AM

Jul 11, 2003, 2:10 AM

Paul

Veteran (19537 posts)

Jul 11, 2003, 2:10 AM

Post #4 of 14

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Re: [Malik] chop and chomp -- wt?'s new line character??? In reply to

No, chop is used to remove the last character in a string. chomp is used to remove newlines.

Jul 11, 2003, 2:13 AM

Andy

Veteran / Moderator (18436 posts)

Jul 11, 2003, 2:13 AM

Post #5 of 14

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Re: [Paul] chop and chomp -- wt?'s new line character??? In reply to

>>>Also your example didn't even use chomp (and contains syntax errors) <<<

I was trying to show what newlines did Wink

Andy (mod)
andy@ultranerds.co.uk

Jul 11, 2003, 5:32 AM

Malik

Novice (15 posts)

Jul 11, 2003, 5:32 AM

Post #6 of 14

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Re: [Andy] chop and chomp -- wt?'s new line character??? In reply to

Thanx Andy, Thanx Paul. But, from your example Andy i could see removing the newline characters only make a mess. So why we do that?

Can you guys please tell me how this comes into use? or how is this useful?

Please dont mind if this sounds too stupid of a question, but i really wanna know.

Jul 11, 2003, 5:41 AM

Andy

Veteran / Moderator (18436 posts)

Jul 11, 2003, 5:41 AM

Post #7 of 14

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Re: [Malik] chop and chomp -- wt?'s new line character??? In reply to

Well, for example, when we have a newline on the end of a variable, and we want to use it to write a file. We obviously can't have spaces in it it, or newlins breaks, otherwise it would cause an error.

Another exaple. You want to format your perl script so the HTML appears all tidy. You could use something like;

print "<html>\n";
print "<body>\n";

to make it appaer like;

<html>
<body>

..and not...

<html><body>

Just a couple of examples as to its use. Its one of those kind of features that you don't use, until you really need it (when you get more into programming)

Cheers

Andy (mod)
andy@ultranerds.co.uk

Jul 11, 2003, 6:30 AM

Malik

Novice (15 posts)

Jul 11, 2003, 6:30 AM

Post #8 of 14

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Re: [Andy] chop and chomp -- wt?'s new line character??? In reply to

Thanx Andy.

It's yet not completely clear to me but one thing i understood is that i can start 'chop'ing and 'chomp'ing with complete understanding once i am into real programin'. Crazy

Thanx once again.

Jul 11, 2003, 6:48 AM

Mark Badolato

Veteran (1509 posts)

Jul 11, 2003, 6:48 AM

Post #9 of 14

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Re: [Paul] chop and chomp -- wt?'s new line character??? In reply to

In Reply To:

No, chop is used to remove the last character in a string. chomp is used to remove newlines.

Actually chomp is used to remove whatever character $/ is set to, which defaults to newline (\n)

--mark

Jul 11, 2003, 6:53 AM

Andy

Veteran / Moderator (18436 posts)

Jul 11, 2003, 6:53 AM

Post #10 of 14

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Re: [Mark Badolato] chop and chomp -- wt?'s new line character??? In reply to

LOL.... finally Paul gets a taste of his own medicine (re making someone look like an idiot cos they didn't get something totally right) Tongue

Andy (mod)
andy@ultranerds.co.uk

Jul 11, 2003, 7:13 AM

Paul

Veteran (19537 posts)

Jul 11, 2003, 7:13 AM

Post #11 of 14

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Re: [Mark Badolato] chop and chomp -- wt?'s new line character??? In reply to

Yeah I know, but I didn't feel like going into all that. I was actually reading the perldoc before replying.

Jul 11, 2003, 8:05 AM

Alex

Administrator (9387 posts)

Jul 11, 2003, 8:05 AM

Post #12 of 14

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Re: [Mark Badolato] chop and chomp -- wt?'s new line character??? In reply to

Quote:

Actually chomp is used to remove whatever character $/ is set to, which defaults to newline (\n)

Actually it defaults to whatever the o/s uses as a newline, on windows that will be \r\n. =) Sorry, couldn't resist.

Cheers,

Alex
--
Gossamer Threads Inc.

Jul 11, 2003, 5:14 PM

Mark Badolato

Veteran (1509 posts)

Jul 11, 2003, 5:14 PM

Post #13 of 14

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Re: [Alex] chop and chomp -- wt?'s new line character??? In reply to

ah tis true. btw, i wasnt trying to give paul the smackdown :) :)

Jul 11, 2003, 5:59 PM

Paul

Veteran (19537 posts)

Jul 11, 2003, 5:59 PM

Post #14 of 14

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Re: [Mark Badolato] chop and chomp -- wt?'s new line character??? In reply to

I wouldn't have minded if you were, I'm used to it Wink