Visit Our UNIX and Linux User Community

Top Forums Shell Programming and Scripting How to get lines having a variable in perl? Post 302843783 by twistedpair on Thursday 15th of August 2013 04:20:39 AM
Old 08-15-2013
Thanks, i got it where i missed. I just did chomp of the variable. Now its working. I think when i extracted $ra new line character also came. So i removed it. It took almost 4 hours for to do experiments & figure out.
Code:
$ra = substr ($lastword,$n);
print "$lastword";
print "$ra";
chomp($ra);
# printing the iop corresponding to real address
open (TST, '<psi.txt');

while ( $iop = <TST>)
{ # chomp;
  if( $iop =~ /$ra/ ){
      print "$iop";
      last;
  }
}


Last edited by Franklin52; 08-15-2013 at 05:44 AM.. Reason: Please use code tags
 
Test Your Knowledge in Computers #470
Difficulty: Medium
As of December 2018 the NTP pool consisted of around 7,700 active time servers on IPv4.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

lines from file to variable

I have a text file that contains a word on each line. I want to be able to use each word as a variable to be put into a URL. I have been trying to put together a for loop but I am not having much luck. So basically all I am trying to do is for line in ~/desktop/test.txt do curl -s... (4 Replies)
Discussion started by: iCONAN
4 Replies

2. Shell Programming and Scripting

Multiple variable in a variable in Perl

Hi All, I am trying to convert the below Csh while loop into Perl while loop but the problem is that in this csh script, i have 2 variables inside a variable -> $count is a variable {SB$count} as a whole is another variable. Csh is able to assign values to such variable like the below but i do... (3 Replies)
Discussion started by: Raynon
3 Replies

3. Shell Programming and Scripting

[Perl] Insert lines before lines.

Hi, New problem, or challenge as they prefer in the US. I need to insert some lines in a file before certain other lines. To make it more clear: Original file: aaaa bbbbb ccccc ddddd bbbbb fffff ggggg Now I want to insert the line "NEW_NEW_NEW" when I match "fffff", but I want... (7 Replies)
Discussion started by: ejdv
7 Replies

4. Shell Programming and Scripting

combine two perl lines into a single perl command

Hi Everyone, i have a string 00:44:40 so: $tmp=~ s/://gi; $tmp=~s/({2})({2})({2})/$1*3600+$2*60+$3/e; the output is 2680. Any way to combine this two lines into a single line? Thanks (4 Replies)
Discussion started by: jimmy_y
4 Replies

5. Shell Programming and Scripting

Append variable to only certain lines

Hi There! I'm trying to write a shell script which generates a random hexadecimal number and then appends it to the end of lines XX onwards of a certain file. XX is determined by a certain string on the previous line. Thus for example, if the input file is I search for the string... (3 Replies)
Discussion started by: orno
3 Replies

6. Shell Programming and Scripting

perl - how can we name a variable base on value of another variable

Hey all, perl - how can we name a variable base on the value of another variable? for example in ksh/bash we do : export c="100" export x`echo $c`=2000 echo $x100 x100=2000 is it possible to do something similar for perl? I already tried many ways but nothing is working. I am... (3 Replies)
Discussion started by: cacm1975
3 Replies

7. Shell Programming and Scripting

Trying to break up a lines in a variable

I was trying to figure out a way to split along a CR in a variable. In the code below, the result for CPU returns CPU=`cat /proc/cpuinfo | grep -i 'model name' |awk -F ':' '{ print $2}'` for echo $CPU AMD Phenom(tm) 9850 Quad-Core Processor AMD Phenom(tm) 9850 Quad-Core Processor... (7 Replies)
Discussion started by: baggins2000
7 Replies

8. Shell Programming and Scripting

Perl XML, find matching condition and grep lines and put the lines somewhere else

Hi, my xml files looks something like this <Instance Name="New York"> <Description></Description> <Instance Name="A"> <Description></Description> <PropertyValue Key="false" Name="Building A" /> </Instance> <Instance Name="B"> ... (4 Replies)
Discussion started by: tententen
4 Replies

9. Shell Programming and Scripting

[Perl] Split lines into array - variable line items - variable no of lines.

Hi, I have the following lines that I would like to see in an array for easy comparisons and printing: Example 1: field1,field2,field3,field4,field5 value1,value2,value3,value4,value5Example 2: field1,field3,field4,field2,field5,field6,field7... (7 Replies)
Discussion started by: ejdv
7 Replies

10. Shell Programming and Scripting

Perl help - how to assign output of perl to variable

Hi, guys, i have a script i inherited from a coworker but i'm not perl savy. The script works but i would like it to work better. I want to run this command ./ciscomgrtest.pl -r "show version" -h hosts.router and have the script goto each router in the hosts.router file and run the command... (2 Replies)
Discussion started by: whipuras
2 Replies
IO::Capture::Stdout(3pm)				User Contributed Perl Documentation				  IO::Capture::Stdout(3pm)

NAME
IO::Capture::Stdout - Capture any output sent to STDOUT SYNOPSIS
# Generic example (Just to give the overall view) use IO::Capture::Stdout; $capture = IO::Capture::Stdout->new(); $capture->start(); # STDOUT Output captured print STDOUT "Test Line One "; print STDOUT "Test Line Two "; print STDOUT "Test Line Three "; $capture->stop(); # STDOUT output sent to wherever it was before 'start' # In 'scalar context' returns next line $line = $capture->read; print "$line"; # prints "Test Line One" $line = $capture->read; print "$line"; # prints "Test Line Two" # move line pointer to line 1 $capture->line_pointer(1); $line = $capture->read; print "$line"; # prints "Test Line One" # Find out current line number $current_line_position = $capture->line_pointer; # In 'List Context' return an array(list) @all_lines = $capture->read; # More useful example 1 - "Using in module tests" # Note: If you don't want to make users install # the IO::Capture module just for your tests, # you can just install in the t/lib directory # of your module and use the lib pragma in # your tests. use lib "t/lib"; use IO::Capture::Stdout; use Test::More; my $capture = IO::Capture::Stdout->new; $capture->start # execute with a bad parameter to make sure get # an error. ok( ! $test("Bad Parameter") ); $capture->stop(); DESCRIPTION
The module "IO::Capture::Stdout", is derived from the abstract class "IO::Capture". See IO::Capture. The purpose of the module (as the name suggests) is to capture any output sent to "STDOUT". After the capture is stopped, the STDOUT filehandle will be reset to the previ- ous location. E.g., If previously redirected to a file, when "IO::Capture->stop" is called, output will start going into that file again. Note: This module won't work with the perl function, system(), or any other operation involving a fork(). If you want to capture the output from a system command, it is faster to use open() or back-ticks. my $output = `/usr/sbin/ls -l 2>&1`; METHODS
new o Creates a new capture object. o An object can be reused as needed, so will only need to do one of these. o Be aware, any data previously captured will be discarded if a new capture session is started. start o Start capturing data into the "IO::Capture" Object. o Can not be called on an object that is already capturing. o Can not be called while STDOUT tied to an object. o "undef" will be returned on an error. stop o Stop capturing data and point STDOUT back to it's previous output location I.e., untie STDOUT read o In Scalar Context o Lines are read from the buffer at the position of the "line_pointer", and the pointer is incremented by one. $next_line = $capture->read; o In List Context o The array is returned. The "line_pointer" is not affected. @buffer = $capture->read; o Data lines are returned exactly as they were captured. You may want to use "chomp" on them if you don't want the end of line charac- ter(s) while (my $line = $capture->read) { chomp $line; $cat_line = join '', $cat_line, $line; } line_pointer o Reads or sets the "line_pointer". my $current_line = $capture->line_pointer; $capture->line_pointer(1); SUB-CLASSING Adding Features If you would like to sub-class this module to add a feature (method) or two, here is a couple of easy steps. Also see IO::Capture::Over- view. 1 Give your package a name package MyPackage; 2 Use this "IO::Capture::Stdout" as your base class like this: package MyPackage; use base qw/IO::Capture::Stdout/; 3 Add your new method like this package MyPackage; use base qw/IO::Capture::Stdout/; sub grep { my $self = shift; for $line ( } See Also IO::Capture::Overview IO::Capture IO::Capture::Stderr AUTHORS
Mark Reynolds reynolds@sgi.com Jon Morgan jmorgan@sgi.com COPYRIGHT
Copyright (c) 2003, Mark Reynolds. All Rights Reserved. This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself. perl v5.8.8 2007-07-30 IO::Capture::Stdout(3pm)

Featured Tech Videos

All times are GMT -4. The time now is 12:04 AM.
Unix & Linux Forums Content Copyright 1993-2020. All Rights Reserved.
Privacy Policy