Visit Our UNIX and Linux User Community


Perl script to match a pattern and print lines


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Perl script to match a pattern and print lines
# 1  
Old 12-18-2008
Perl script to match a pattern and print lines

Hi
I have a file (say 'file1')and I want to search for a first occurence of pattern (say 'ERROR') and print ten lines in the file below pattern. I have to code it in PERL and I am using Solaris 5.9.

I appreciate any help with code

Thanks
Ammu
# 2  
Old 12-19-2008
ammu,

Try this script, if it were called... myscript.pl
chmod 755 myscript.pl
cat file1 | ./myscript.pl



#!/usr/bin/env perl

$p=0;
$c=0;
while (<STDIN>) {
if ($p == 0 && m/ERROR/) {
$p=1;
$c=$. + 10;
}

if ($p == 1) {
if ($. < $c) {
print $_;
} else {
last;
}
}
}
# 3  
Old 12-19-2008
Hi, below package contains serverl method, 'getLinesAfterString' may address your issue.

Code:
package LeoFile;
sub new{
	return bless {};
}
sub _open{
	my $file=shift;
	open FH,"<$file";
}
sub _close{
	close FH;
}
sub _checkPattern{
	my($ref,$pat)=(@_);
	@tmp=@{$ref};
	print "@{$ref}" if($matched==1);
}	
sub getLinesAfterString{
	shift;
	my($file,$str,$line)=(@_);
	_open($file);
	my $cnt;
	while(<FH>){
		$flag=1 if(m/$str/);
		if($flag && $cnt<$line){
			print $_;
			$cnt++;
		}
		else{
			$cnt=0;
			$flag=0;
			next;			
		}
	}
	_close;
}
sub getLinesBetweenString{
	shift;
	my($file,$str1,$str2)=(@_);
	_open($file);
	while(<FH>){
		$flag=1 if(m/$str1/);
		print if ($flag==1);
		$flag=0 if(m/$str2/);
	}
	_close;
}
sub getLinesBetweenStringContainPattern{
	shift;
	my($file,$str1,$str2,$pat)=(@_);
	_open($file);
	while(<FH>){
		$flag=1 if(m/$str1/);
		push @arr,$_ if($flag==1);
		$matched=1 if(m/$pat/);
		if(m/$str2/){
			$flag=0;
			_checkPattern(\@arr,$matched);
			undef @arr;
			$matched=0;
		}
	}
	_close;
}
1

# 4  
Old 12-19-2008
perl script for dbms_stats package

Hi,

my sorry i wrote wrong wrongly here
Thanks

Prakash

Last edited by prakash.gr; 12-19-2008 at 03:07 AM.. Reason: wrongly entered in this thread
# 5  
Old 12-19-2008
You can use Tie::File and access the file like an array so its easy to jump lines in a file since you can use the line numbers as the array index.
# 6  
Old 12-19-2008
Code:
open (IN, 'file1') or die "$!";
while (<IN>) { 
   if (m/ERROR/) { 
      for (1..10) {
         <IN>;#skips 10 lines
      }
      print;
      last;#stops the "while" loop
   }
}
close IN;

# 7  
Old 12-22-2008
Quote:
Originally Posted by ammu
Hi
I have a file (say 'file1')and I want to search for a first occurence of pattern (say 'ERROR') and print ten lines in the file below pattern. I have to code it in PERL and I am using Solaris 5.9.

I appreciate any help with code

Thanks
Ammu
One more Solution:

open(FH, "<file1");
@a=<FH>;
$b=$#a;
for ($n=0;$n<$b;$n++)
{

if ($a[$n]=~/ERROR/)
{
foreach $_ ( @a[$n..($n+10)])
{
print $_;
}
}
}
close(FH);

Last edited by jatanig; 12-22-2008 at 04:33 AM..

Previous Thread | Next Thread
Test Your Knowledge in Computers #129
Difficulty: Easy
The original Linux source code was developed by Linus Torvalds and the GNU Foundation.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Match Pattern and print pattern and multiple lines into one line

Hello Experts , require help . See below output: File inputs ------------------------------------------ Server Host = mike id rl images allocated last updated density vimages expiration last read <------- STATUS ------->... (4 Replies)
Discussion started by: tigerhills
4 Replies

2. Shell Programming and Scripting

awk print pattern match line and following lines

Data: Pattern Data Data Data Data Data Data Data Data Data ... With awk, how do I print the pattern matching line, then the subsequent lines following the pattern matching line. Varying number of lines following the pattern matching line. (9 Replies)
Discussion started by: dmesserly
9 Replies

3. Shell Programming and Scripting

Print lines that do not match the pattern

I need to print the lines that do not match a pattern. I tried using grep -v and sed -n '/pattern/!p', but both of them are not working as I am passing the pattern as variable and it can be null some times. Example ........ abcd...... .........abcd...... .........abcd......... (4 Replies)
Discussion started by: sunny1234
4 Replies

4. Shell Programming and Scripting

Need one liner to search pattern and print everything expect 6 lines from where pattern match made

i need to search for a pattern from a big file and print everything expect the next 6 lines from where the pattern match was made. (8 Replies)
Discussion started by: chidori
8 Replies

5. Shell Programming and Scripting

Print lines before and after pattern match

I am using Solaris, I want to print 3 lines before pattern match pattern 5 lines after pattern match Pattern is abcd to be searched in a.txt. Looking for the solution in sed/awk/perl. Thanks .. Input File a.txt: ================= 1 2 3 abcd 4 5 6 7 8 (7 Replies)
Discussion started by: manuswami
7 Replies

6. Shell Programming and Scripting

perl script print the lines between two pattern

i have a file as below sample.pl parameter1 argument1 argument2 parameter2 I want out as below argument1 argument2 that is , i want to print all the lines between parameter1 & parameter 2. i tried with the following if($mystring =~ m/parameter1(.*?)parameter2/) (2 Replies)
Discussion started by: roopa
2 Replies

7. Shell Programming and Scripting

print lines with exact pattern match

I have in a file domain.com. 1909 IN A 1.22.33.44 domain.com. 1909 IN A 22.33.44.55 ns1.domain.com. 1699 IN A 33.44.55.66 ns2.domain.com. 1806 IN A 77.77.66.66 I need to "grep" or "awk" out the lines starting with domain.com. as follows. domain.com. 1909 IN A 1.22.33.44 domain.com.... (3 Replies)
Discussion started by: anilcliff
3 Replies

8. Shell Programming and Scripting

print chunk of lines only if there is a pattern match in between them

Hi All, Please find the sample file below: NAME ID NUMBER -------------------------------------------------------------------------------------------------- --------- abcdefgheija;lksdf ... (13 Replies)
Discussion started by: niel.verty
13 Replies

9. Shell Programming and Scripting

sed print all lines after pattern match

HiCan someone show me how to print all lines from a file after a line matching a pattern using sed?Thanks (13 Replies)
Discussion started by: steadyonabix
13 Replies

10. Shell Programming and Scripting

Perl: Printing Multiple Lines after pattern match

Hello People, Need some assistance/guidance. OUTLINE: Two files (File1 and File2) File1 has some ids such as 009463_3922_1827 897654_8764_5432 File2 has things along the lines of: Query= 009463_3922_1827 length=252 (252 letters) More stufff here ... (5 Replies)
Discussion started by: Deep9000
5 Replies

Featured Tech Videos