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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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TAIL(1) 						      General Commands Manual							   TAIL(1)

NAME
tail - deliver the last part of a file SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ] tail [ -fr ] [ -n nlines ] [ -c ncharacters ] [ file ] DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied. Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or characters, according to the appended flag or Default is -10l (ten ell). The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears. The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed. EXAMPLES
tail file Print the last 10 lines of a file. tail +0f file Print a file, and continue to watch data accumulate as it grows. sed 10q file Print the first 10 lines of a file. SOURCE
/sys/src/cmd/tail.c BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length. According to custom, option +number counts lines from 1, and counts blocks and characters from 0. TAIL(1)
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