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if match found go to a particular line in perl

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Top Forums Shell Programming and Scripting if match found go to a particular line in perl
# 8  
Old 03-31-2008
got one way
Quote:
Originally Posted by user_prady
I tried almost all way using next , redo and last command in perl , But I can't get these syntax correctly in perl. I know its easy ,but still I cant find the efficient way using while and next statement in perl.

I am trying to do the follwoing in perl

Code:
nawk ' {
        if($0 ~ /^\*Main Start/){
	     while( $0 !~ /^\*Main End/){
	     print $0;
             getline;
        }
     }
 } ' my.txt

One more code I want to do it in perl pls give me some basic idea how to do it without creating any temporary files ..

Code:
TMP=/tmp/my_tmp$$
nawk '
/\*Main End/{
split(x,arr,",")
print "Loop  " arr[1]
};
{x=$0
}
' my.txt > $TMP 

nawk '{
if($0 ~ /^Loop/){
    loop = $2 
    next;
  }
if($0 ~ /^\*Main Start/){
     printf "\nrepeat ("
     print  loop

} ' $TMP $my.txt


Thanks & Regards,
user_prady
At last I got one way to do it.

Code:
my @buffer;
$#buffer = 1;
open(IN, $file)|| die("Could not open file");
 
while(<IN>){
        push@buffer => $_;
        shift@buffer;
}
close(IN);
open(IN, $file)|| die("Could not open file");
while(<IN>){ 
       print $buffer[0] if/^\*Main Start/ ;
}
close(IN);

Regards,
prady
# 9  
Old 03-31-2008
Quote:
Originally Posted by KevinADC
You could use the Tie::File module for this which avoids the brute approach "era" mentioned. With Tie::File you treat a file like a perl array, so if you find a pattern in a certain line you just use simple array indexing to go back one line in the file. See the Tie::File (a perl core module) documentation for usage details.
Thanks Kevin for your time and kind ..

But when I am trying to use the module Tie::File I am getting the follwing error.
Code:
Can't locate Tie/File.pm in @INC (@INC contains: /usr/perl5/5.00503/sun4-solaris /usr/perl5/5.00503 /usr/perl5/site_perl/5.005/sun4-solaris /usr/perl5/site_perl/5.005 .) at ./mdl.pl line 5.
BEGIN failed--compilation aborted at ./mdl.pl line 5.

This is first time I'll use a module so pls if I am doing something wrong with my code pls suggest me.

Code:
use Tie::File;
tie @array, 'Tie::File', $file or die ("Could not open file");
print $array[13] ;

Regards,
user_prady
Last edited by user_prady; 03-31-2008 at 04:14 AM..
# 10  
Old 03-31-2008
Tie::File has been a core module for a while, but I am not sure since when. The problem is that your server is using a very old version of perl 5.005, so either it was not included with the distribution of perl you have or it was removed for some reason.
# 11  
Old 03-31-2008
You could do something like this:

Code:
use strict;
use warnings;
my $flag = 0;
my $last_line;
while(<DATA>){
   if(/^\*Main Start/){
      $flag = 1;
   }
   elsif($flag && /^\*Main End/) {
         $numbers = (split(',',$last_line))[0];
         $last_line = '';
         $flag = 0; 
         print $numbers,"\n";
   }
   else {
      $last_line = $_;
      next;
   }
}	
__DATA__
*Init End
*Main Start
*Comment Reset Timers
000000,0000,0,0,0,0,0,1,0
000000,0000,0,0,0,0,1,1,0 
*Comment Control Frame at 1.04596 ms
000000,0400,0,0,0,0,1,0,1
2418A4,0000,0,1,3,0,0,0,0 
049C00,0000,0,0,2,0,0,0,0
*Comment Control Frame at 1.04673 ms
*Comment Control Frame at
000002,0000,0,0,0,0,1,0,1
241002,0000,0,1,3,0,0,0,0
000100,0000,0,0,2,0,0,0,0
*Comment Control Frame at
000004,0000,0,0,0,0,1,0,1
241002,0000,0,1,3,0,0,0,0
000000,0000,0,0,2,0,0,0,0
*Comment Frame 13 at ** us,,,,,,,,
000005,7E3D,0,0,0,0,1,0,1
*Main End,,,,,,,,

# 12  
Old 03-31-2008
Quote:
Originally Posted by KevinADC
Tie::File has been a core module for a while, but I am not sure since when. The problem is that your server is using a very old version of perl 5.005, so either it was not included with the distribution of perl you have or it was removed for some reason.
Thanks Kevin.

I read your previous article how to fix the problem on the module issue

Perl - read a line from a file and writing to the same line in the file

But still getting the error....

Anyway many many thanks for your time and given code. I'll try it.


Regards,
prady
# 13  
Old 03-31-2008
Quote:
Originally Posted by KevinADC
You could do something like this:

Code:
use strict;
use warnings;
my $flag = 0;
my $last_line;
while(<DATA>){
   if(/^\*Main Start/){
      $flag = 1;
   }
   elsif($flag && /^\*Main End/) {
         $numbers = (split(',',$last_line))[0];
         $last_line = '';
         $flag = 0; 
         print $numbers,"\n";
   }
   else {
      $last_line = $_;
      next;
   }
}	
__DATA__
*Init End
*Main Start
*Comment Reset Timers
000000,0000,0,0,0,0,0,1,0
000000,0000,0,0,0,0,1,1,0 
*Comment Control Frame at 1.04596 ms
000000,0400,0,0,0,0,1,0,1
2418A4,0000,0,1,3,0,0,0,0 
049C00,0000,0,0,2,0,0,0,0
*Comment Control Frame at 1.04673 ms
*Comment Control Frame at
000002,0000,0,0,0,0,1,0,1
241002,0000,0,1,3,0,0,0,0
000100,0000,0,0,2,0,0,0,0
*Comment Control Frame at
000004,0000,0,0,0,0,1,0,1
241002,0000,0,1,3,0,0,0,0
000000,0000,0,0,2,0,0,0,0
*Comment Frame 13 at ** us,,,,,,,,
000005,7E3D,0,0,0,0,1,0,1
*Main End,,,,,,,,

Yes Kevin . I am pretty close to my goal but one thing that I want the number (ie, 000005) when *Main Start pattern found .

Regards,
user_prady
# 14  
Old 03-31-2008
Quote:
Originally Posted by user_prady
Yes Kevin . I am pretty close to my goal but one thing that I want the number (ie, 000005) when *Main Start pattern found .

Regards,
user_prady
With the sample data you posted, the code I posted does that, it prints 000005.
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