Perl Guru Forums: Perl Programming Help: Beginner: Fetch specific content from file

CGI/Perl Guide | Learning Center | Forums | Advertise | Login

Site Search: in


	MAIN INDEX	SEARCH POSTS	WHO'S ONLINE	LOG IN

Home: Perl Programming Help: Beginner:
Fetch specific content from file

sheet.pangasa
Novice

Jan 11, 2013, 9:10 AM

Post #1 of 10 (983 views)

Fetch specific content from file	Can't Post

Hi All,

I know perl has extremely good string manipulation capabilities and a lot can be done through it. I have a file which gets generated by one process and there is a requirement to fetch specific content from the file and either store the output is a separate file or make the modifications to the same file. The contents of the file are below. I just need to fetch the folder names from it. The folder names will change whenever the process runs but everything above and below it will remain same except the date etc:

Code

 
Informatica(r) PMREP, version [8.6.0], build [178.0613], Windows 32-bit 
Copyright (c) Informatica Corporation 1994 - 2008 
All Rights Reserved. 
This Software may be protected by U.S. Patent Numbers 6,208,990; 6,044,374; 6,014,670; 6,032,158; 5,794,246; 6,339,775; 6,850,947; 6,895,471; 7,254,590 and other U.S. Patents Pending. 
 
Invoked at Fri Jan 11 22:32:09 2013 
 
Connected to repository repo1 in Domain_SheetPangasa-PC as user Administrator 
connect completed successfully. 
 
Completed at Fri Jan 11 22:32:14 2013 
Successfully connected to repo1 
 
Informatica(r) PMREP, version [8.6.0], build [178.0613], Windows 32-bit 
Copyright (c) Informatica Corporation 1994 - 2008 
All Rights Reserved. 
This Software may be protected by U.S. Patent Numbers 6,208,990; 6,044,374; 6,014,670; 6,032,158; 5,794,246; 6,339,775; 6,850,947; 6,895,471; 7,254,590 and other U.S. Patents Pending. 
 
Invoked at Fri Jan 11 22:32:14 2013 
 
f1 
ff4 
f5 
f8 
f9 
f10 
folder1 
folder2 
folder3 
f2 
f3 
f6 
f7 
.listObjects completed successfully. 
 
Completed at Fri Jan 11 22:32:19 2013 
Folder list has been fetched successfully for repo1

From the above contents i would want to fetch:

Code

f1 
ff4 
f5 
f8 
f9 
f10 
folder1 
folder2 
folder3 
f2 
f3 
f6 
f7

Any pointers on how this can be done in perl? I can do this using shell with grep or sed but would really want to do in perl.

thanks,
Sheet

(This post was edited by sheet.pangasa on Jan 11, 2013, 9:17 AM)

FishMonger
Veteran / Moderator

Jan 11, 2013, 10:16 AM

Post #2 of 10 (977 views)

Re: [sheet.pangasa] Fetch specific content from file [In reply to]	Can't Post

What have you tried thus far?

Are you looking for someone to write the script for you or do you just need help troubleshooting your script?

What is your level of experience in Perl?

sheet.pangasa
Novice

Jan 11, 2013, 10:23 AM

Post #3 of 10 (975 views)

Re: [FishMonger] Fetch specific content from file [In reply to]	Can't Post

Thanks for the reply. I am not looking someone to do the work for me. I am very new to perl. I just need a direction on what functions to look for. I can then do some search and come up with a code. If that code does not work for me i would be seeking little help in improving it, not asking anyone to do the actual work for me.

thanks.

sheet.pangasa
Novice

Jan 11, 2013, 10:25 AM

Post #4 of 10 (973 views)

Re: [FishMonger] Fetch specific content from file [In reply to]	Can't Post

right now i am reading about the Translation tr function to see if that can be used.

FishMonger
Veteran / Moderator

Jan 11, 2013, 10:32 AM

Post #5 of 10 (970 views)

Re: [sheet.pangasa] Fetch specific content from file [In reply to]	Can't Post

I don't know what portions of the task you need help with, but here's how I'd begin to approach it and adjust as needed.

Loop/skip over the contents until you reach the "Invoked at .." line.

Then start a new loop which outputs the desired lines until it reaches the ".listObjects completed .." line or which ever line that can be identified as the stopping point.

FishMonger
Veteran / Moderator

Jan 11, 2013, 10:34 AM

Post #6 of 10 (968 views)

Re: [sheet.pangasa] Fetch specific content from file [In reply to]	Can't Post

In Reply To

right now i am reading about the Translation tr function to see if that can be used.

Based on what you've provided so far, I don't see anything that indicates that the tr function would be useful. You might need/want to use a regex.

sheet.pangasa
Novice

Jan 11, 2013, 10:40 AM

Post #7 of 10 (965 views)

Re: [FishMonger] Fetch specific content from file [In reply to]	Can't Post

Yup regex is next in the list... and i was also thinking on the same approach to use loops like you mentioned. I will check and come up with something.

thanks.

sheet.pangasa
Novice

Jan 11, 2013, 11:38 AM

Post #8 of 10 (961 views)

Re: [FishMonger] Fetch specific content from file [In reply to]	Can't Post

did some research and came up with the below code. I know it's not pretty but is doing the job for me and i have the folder names in a separate file. The only problem is i have too many empty/blank line on the top and bottom. Next step is to try and trim that. Tried chomp but then it trims the new line char as well which i don' want.

Code

#!/usr/bin/perl 
use strict; 
use warnings; 
 
my ($qfn_in, $qfn_out) = @ARGV; 
 
open(my $fh_in, '<', $qfn_in) 
   or die("Unable to read file \"$qfn_in\": $!\n"); 
 
open(my $fh_out, '>', $qfn_out) 
   or die("Unable to create file \"$qfn_out\": $!\n"); 
 
while (<$fh_in>) { 
   if (!(/(PMREP|Copyright|All Rights Reserved|Patent|Invoked|Connected to repository|connect completed successfully|Completed at|Successfully|.listObjects|fetched)/)) { 
      print $fh_out $_; 
   } 
}

Output

Code

 
 
 
 
 
 
 
f1 
ff4 
f5 
f8 
f9 
f10 
folder1 
folder2 
folder3 
f2 
f3 
f6 
f7

FishMonger
Veteran / Moderator

Jan 11, 2013, 11:42 AM

Post #9 of 10 (959 views)

Re: [sheet.pangasa] Fetch specific content from file [In reply to]	Can't Post

Add this before the if block.

Code

next if /^\s*$/;

FishMonger
Veteran / Moderator

Jan 11, 2013, 11:56 AM

Post #10 of 10 (956 views)

Re: [sheet.pangasa] Fetch specific content from file [In reply to]	Can't Post

This is more verbose, but is a lot more efficient than using your regex.

Code

#!/usr/bin/perl 
 
use strict; 
use warnings; 
 
my $invoked = 0; 
 
LINE: while (<DATA>) { 
    next if /^\s*$/; 
    if ( $invoked == 2 ) { 
        while (<DATA>) { 
            next if /^\s*$/; 
            last LINE if /^.listObjects completed/; 
            print; 
        } 
    } 
    $invoked++ if /^Invoked/; 
} 
 
 
__DATA__ 
Informatica(r) PMREP, version [8.6.0], build [178.0613], Windows 32-bit 
Copyright (c) Informatica Corporation 1994 - 2008 
All Rights Reserved. 
This Software may be protected by U.S. Patent Numbers 6,208,990; 6,044,374; 6,014,670; 6,032,158; 5,794,246; 6,339,775; 6,850,947; 6,895,471; 7,254,590 and other U.S. Patents Pending. 
 
Invoked at Fri Jan 11 22:32:09 2013 
 
Connected to repository repo1 in Domain_SheetPangasa-PC as user Administrator 
connect completed successfully. 
 
Completed at Fri Jan 11 22:32:14 2013 
Successfully connected to repo1 
 
Informatica(r) PMREP, version [8.6.0], build [178.0613], Windows 32-bit 
Copyright (c) Informatica Corporation 1994 - 2008 
All Rights Reserved. 
This Software may be protected by U.S. Patent Numbers 6,208,990; 6,044,374; 6,014,670; 6,032,158; 5,794,246; 6,339,775; 6,850,947; 6,895,471; 7,254,590 and other U.S. Patents Pending. 
 
Invoked at Fri Jan 11 22:32:14 2013 
 
f1 
ff4 
f5 
f8 
f9 
f10 
folder1 
folder2 
folder3 
f2 
f3 
f6 
f7 
.listObjects completed successfully. 
 
Completed at Fri Jan 11 22:32:19 2013 
Folder list has been fetched successfully for repo1

Search for (options)

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives