searching a sub-string in a string


 
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# 1  
Old 07-22-2011
searching a sub-string in a string

Im trying to download a file from a website.

But i want to download only if the file version is latest than the same file I have.

The file name is CTP-LATEST-5.3.0.37.iso

I need to check the string "37" in the file name.

So if the number 37 is greater than the version Im already having then only I download.

Once I download the file I want to store the string "37" is a file so that I can read it next time when I run the perl code to check for version

Here is my code Im trying with
Code:
#!/usr/bin/perl 
use LWP::Simple; 
 #my $version =37;//this whole line is commented 
Open file version.txt and get the version number(say 37)and store it in $version     
 
 
$pageURL="http://www.google.comisos/psfsS5.3/LATIMGODCVP/";  
 
$simplePage=get($pageURL); 
 
Now $simplePage has the substring  "CTP-LATEST-5.3.0.(some_version_number).iso"  
 
I need to get that "some_version_number". HOW ? 
 
 
if(some_version_numner > $version) 
 
{ 
 
 
#-- fetch the zip and save it as perlhowto.zip 
my $status = getstore("http://www.google.com/isos/psfsS5.3/LATIMGODCVP/CVP-LATEST-5.3.0."$version".iso", "CTP-Latest5.3.0.$version.iso"); 
 
if ( is_success($status) ) 
{ 
 print "file downloaded correctly\n"; 
 
 Store the "some_version_number in file version.txt (for next time use) 
 
} 
else 
{ 
 print "error downloading file: $status\n"; 
 } 
 
} 

Please not that In the website there are other files with .iso extension , But I need the only the file with "CTP-LATEST-5.3.0." prefix

I hope everything is clear in code. The version.txt has only 1 string stored that is any number (say 37 or 45 or 89 etc )

Can someone help me on how to do the rest of the code ?
# 2  
Old 07-22-2011
Tools Substr

Quote:
Originally Posted by srijith
Im trying to download a file from a website.

But i want to download only if the file version is latest than the same file I have.

The file name is CTP-LATEST-5.3.0.37.iso

I need to check the string "37" in the file name.

So if the number 37 is greater than the version Im already having then only I download.

Once I download the file I want to store the string "37" is a file so that I can read it next time when I run the perl code to check for version

Here is my code Im trying with
Code:
#!/usr/bin/perl 
use LWP::Simple; 
 #my $version =37;//this whole line is commented 
Open file version.txt and get the version number(say 37)and store it in $version     
 
 
$pageURL="http://www.google.comisos/psfsS5.3/LATIMGODCVP/";  
 
$simplePage=get($pageURL); 
 
Now $simplePage has the substring  "CTP-LATEST-5.3.0.(some_version_number).iso"  
 
I need to get that "some_version_number". HOW ? 
 
 
if(some_version_numner > $version) 
 
{ 
 
 
#-- fetch the zip and save it as perlhowto.zip 
my $status = getstore("http://www.google.com/isos/psfsS5.3/LATIMGODCVP/CVP-LATEST-5.3.0."$version".iso", "CTP-Latest5.3.0.$version.iso"); 
 
if ( is_success($status) ) 
{ 
 print "file downloaded correctly\n"; 
 
 Store the "some_version_number in file version.txt (for next time use) 
 
} 
else 
{ 
print "error downloading file: $status\n"; 
} 
 
} 

Please not that In the website there are other files with .iso extension , But I need the only the file with "CTP-LATEST-5.3.0." prefix

I hope everything is clear in code. The version.txt has only 1 string stored that is any number (say 37 or 45 or 89 etc )

Can someone help me on how to do the rest of the code ?

Hi,

Try this code,

Code:
my $oldVersion="38";##Version.txt File Version
my $simplePage ="CTP-LATEST-5.3.0.37.iso";
my $str = (split("CTP-LATEST-5.3.0.",$simplePage ))[1];
my $version = substr("$str",0,2);
if($version > $oldVersion )
{
   print "NewVersion\n";
   ####Proceed your further code
}
else
{
   print "old Version\n";
   ####Proceed your further code
}

Cheers,
RangaSmilie

Last edited by pludi; 07-22-2011 at 05:21 AM..
# 3  
Old 07-22-2011
Hi Ranga,
I did not understand some of your lines

1) my $simplePage ="CTP-LATEST-5.3.0.37.iso";

why are you hard coding this ?

I need to get this srting from webpage, get only "37" part and then compare it.
# 4  
Old 07-22-2011
Tools Substr

my $simplePage = get(webpage);

This is your code right??

$simplePage may contains data like SomeContent_CTP-LATEST-5.3.0.37.iso right?
# 5  
Old 07-22-2011
Hi I tried your code this way

Code:
#!/usr/bin/perl
 
use LWP::Simple;
my  $oldversion =36;
 
$pageURL="http://www.google.com/isos/preFCS5.3/LATESTGOODCVP/";   
my $simplePage=get($pageURL);  
#my $simplePage ="CTP-LATEST-5.3.0.37.iso";
my $str = (split("CTP-LATEST-5.3.0.",$simplePage ))[1];
my $version = substr("$str",0,2);
if($version =! $oldVersion )
{
print "$version";
 
##-- fetch the zip and save it as perlhowto.zip
my $status = getstore("http://www.google.com/isos/preFCS5.3/LATESTGOODCVP/CTP-LATEST-5.3.0.$version.iso", "CVP-LATEST-5.3.0.$version.iso");
}
else
{
print("Currently new version\n");
}

but its printing $version as 1 , which is not the correct value. The correct value is 37 which its not able to print.
# 6  
Old 07-22-2011
Substr

just print the $simplePage variable and get back me with that value and also send the possibilities.
# 7  
Old 07-22-2011
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
 <head>
  <title>Index of /isos/preFCS5.3/LATESTGOODCVP</title>
 </head>
 <body>
<h1>Index of /isos/preFCS5.3/LATESTGOODCVP</h1>
<table><tr><th><img src="/icons/blank.gif" alt="[ICO]"></th><th><a href="?C=N;O=D">Name</a></th><th><a href="?C=M;O=A">Last modified</a></th><th><a href="?C=S;O=A">Size</a></th><th><a href="?C=D;O=A">Description</a></th></tr><tr><th colspan="5"><hr></th></tr>
<tr><td valign="top"><img src="/icons/back.gif" alt="[DIR]"></td><td><a href="/isos/preFCS5.3/">Parent Directory</a></td><td>&nbsp;</td><td align="right">  - </td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="CVP-LATEST-5.3.0.37.iso">CVP-LATEST-5.3.0.37.iso</a></td><td align="right">19-Jul-2011 03:32  </td><td align="right">816M</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="ChangeLog-LATEST.2011-07-19-03h.30m.01s">ChangeLog-LATEST.2011-07-19-03h.30m.01s</a></td><td align="right">19-Jul-2011 03:32  </td><td align="right"> 16K</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="is.iso">is.iso</a></td><td align="right">19-Jul-2011 03:32  </td><td align="right">816M</td></tr>
<tr><td valign="top"><img src="/icons/unknown.gif" alt="[   ]"></td><td><a href="md5SUM">md5SUM</a></td><td align="right">19-Jul-2011 03:32  </td><td align="right">111 </td></tr>
<tr><th colspan="5"><hr></th></tr>
</table>
<address>Apache/2.2.3 (Red Hat) Server at www.google.com Port 80</address>
</body></html>

here is the content of my page. You can see the filename marked in red. I want to extract only that file name and then from that filename I want to extract the number "37" or anyother number that is there is that place and then compare with already stored number.

37 may change to 38 or 45 or 98 in future days

Last edited by srijith; 07-22-2011 at 06:36 AM..
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