?
Solved

Insert a line in an order TEXT file

Posted on 1998-07-22
5
Medium Priority
?
233 Views
Last Modified: 2010-03-04
Hi,

I would like to know if they have a way to insert a line in
an order TEXT file
example :
Line to insert = "HAA|123"

TEXT file:
AAA|111
BBB|222
>> insert here HAA|123 by looking the 3 first characters
NAA|555
PPP|666
QQQ|777
0
Comment
Question by:woaini
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 5

Accepted Solution

by:
b2pi earned 200 total points
ID: 1208623
use strict;

open(SRC, "<orig.file.name") || die "Couldn't open source";
open(DST, ">orig.file.name.TMP") || die "Couldn't open destination";

my($target) = $ARGV[1]; ## The first parameter is the line to insert
while (<SRC>) {
   chomp;
   if ($target le $_) {
      print DST "$target\n";
      print DST "$_\n";
     while (<SRC>) {
         print DST $_;
    }
   print "$_\n";
}
close(SRC);
close(DST);
unlink ("orig.file.name");
rename("orig.file.name.TMP", "orig.file.name");


0
 
LVL 84

Expert Comment

by:ozo
ID: 1208624
#or
$target = (shift)."\n";
{local $^I = ".TMP"; local @ARGV=("orig.file.name");
 while( <> ){
   print $target if substr($target,0,3) le substr($_,0,3) && ??;
   print;
 }
}
0
 
LVL 84

Expert Comment

by:ozo
ID: 1208625
Oops, that doesn't work if $target comes after all the lines in orig.file.name
(actually, neither does the original answer,
but b2pi's version is easier to fix)
0
 
LVL 5

Expert Comment

by:b2pi
ID: 1208626
Good point, Ozo.

Add to above: (directly before
close(SRC);

the following:

print "$target\n" if $target gt $_;
close(SRC);
etc...


0
 

Author Comment

by:woaini
ID: 1208627
Thank a lot b2pi !!
Thank ozo too.
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
In the distant past (last year) I hacked together a little toy that would allow a couple of Manager types to query, preview, and extract data from a number of MongoDB instances, to their tool of choice: Excel (http://dilbert.com/strips/comic/2007-08…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Six Sigma Control Plans

650 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question