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Top Forums Shell Programming and Scripting Pattern matching in file and then display 10 lines above every time Post 302305252 by sethcoop on Wednesday 8th of April 2009 10:56:56 AM
Old 04-08-2009
Quote:
Originally Posted by digitalrg
Thank you sethcoop.. but can you please tell me how to print 10 lines below the occurance of word "total" please help.....
Thanks
Here is the code to print the number of lines below your search... you can change the variable $lines to be how many lines you want to print after the word total.

Hope this helps!

Code:
#!/usr/bin/perl
$lines = 10;
$x = $lines;
open(F, "file.txt") or die "cannot read file";
while(<F>) {
  chomp;
  $my_line = "$_";
  if ("$x" < "$lines") {
    print "$my_line\n";
    $x++;
  }
  if ("$my_line" =~ "total") {
    $x = 0;
  }
};

 

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PRINT(3)								 1								  PRINT(3)

print - Output a string

SYNOPSIS
int print (string $arg) DESCRIPTION
Outputs $arg. print is not actually a real function (it is a language construct) so you are not required to use parentheses with its argument list. PARAMETERS
o $arg - The input data. RETURN VALUES
Returns 1, always. EXAMPLES
Example #1 print examples <?php print("Hello World"); print "print() also works without parentheses."; print "This spans multiple lines. The newlines will be output as well"; print "This spans multiple lines. The newlines will be output as well."; print "escaping characters is done "Like this"."; // You can use variables inside a print statement $foo = "foobar"; $bar = "barbaz"; print "foo is $foo"; // foo is foobar // You can also use arrays $bar = array("value" => "foo"); print "this is {$bar['value']} !"; // this is foo ! // Using single quotes will print the variable name, not the value print 'foo is $foo'; // foo is $foo // If you are not using any other characters, you can just print variables print $foo; // foobar print <<<END This uses the "here document" syntax to output multiple lines with $variable interpolation. Note that the here document terminator must appear on a line with just a semicolon no extra whitespace! END; ?> NOTES
Note Because this is a language construct and not a function, it cannot be called using variable functions. SEE ALSO
echo(3), printf(3), flush(3), Heredoc syntax. PHP Documentation Group PRINT(3)
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