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Replacing strings in text files

D

Dinh

Limp Gawd
Joined
Aug 27, 2006
Messages
194
I have a set of text files that have the content somewhat similar to the following :

Code: 
header[00]
header[01]
header[02]
header[03]
header[04]

Now, lets say I have a few hundred lines going and I have to add one line. Then, I'll have to waste more renumbering everything.

The reason why? Its part of a javascript file for a header of a website. I only edit the html and know nothing about javascript.

I was thinking of going for something that replaces a certain character into an increasing number set. For example :

Code: 
header[xx]<html>
header[xx]<head>
header[xx]<title>sfsjkfs</title>
header[xx]</head>
header[xx]<body>

I would need a solution that replaces the xx's with increasing numbers (1,2,3,4,5). I've looked up Bat scripting but have no luck. Can someone point me in the right direction?
 
sounds like a horrible design, are you really stuck working with this? granted, i dont know what the reason is for this explicit numbering.

i think perl is the best language for dealing with this. i might be able to whip something up, or at least let you know its feasible, but i would need the following clarification:

1. the lines that you're inserting, will they have a header[xx] is front of them as well?

2. are there multiple sequences of header[xx]'s in a particular file? i.e.

header[00]blah
header[01]blah
la la la
header[00]blah
...
Click to expand...

3. will these added lines always be between a group of header[xx]'s, or might they come in at the end of a sequence?
 
fluxion said:
sounds like a horrible design, are you really stuck working with this? granted, i dont know what the reason is for this explicit numbering.

i think perl is the best language for dealing with this. i might be able to whip something up, or at least let you know its feasible, but i would need the following clarification:

1. the lines that you're inserting, will they have a header[xx] is front of them as well?

2. are there multiple sequences of header[xx]'s in a particular file? i.e.



3. will these added lines always be between a group of header[xx]'s, or might they come in at the end of a sequence?
Click to expand...


Yeah I know, its a horrible solution and much more work than a simple PHP include =/, but I'm stuck with it due to limited resources.

1. Every new line = header[xx] before it (basicly header[xx] before each line of html code).

2. Nope, theres only one huge sequence.

3. Those inserted lines can be anywhere, top or bottom. Its just renumbering is a pain the arse :eek:
 
Dinh said:
2. Nope, theres only one huge sequence.
Click to expand...
Then, isn't the [xx] number just the line number in the file? If so, isn't it trivial to regenerate it? You should be able to write a program that takes an input file like

Code: 
Pittsburgh
Atlanta
New York

and produces the file you desire
Code: 
Header[00]Pittsburgh
Header[01]Atlanta
Header[02]New York

in a couple dozen lines, right?
 
Oh yes, that is a much better idea. But I have no idea what to use.
 
ahh, so the entire file is consistently prefixed? no intermixed areas?

you can do this with a number of tools, sed could knock it out real easy but i dont know how to keep a counter as you iterate through the lines.

here's the jist of it with perl, seems like it should do what you need:

Code: 
fluxion@purity:~/temp$ cat parseFile.pl 
#!/usr/bin/perl

my $c = 0;

while (<>) {
  s/^header\[\d+\]/header[$c]/;
  print $_;
  ++$c;
}
  
fluxion@purity:~/temp$ cat file 
header[34]blah1
header[1]blah2
header[2]blah3
header[5]blah4
header[8]blah5
fluxion@purity:~/temp$ cat file | ./parseFile.pl 
header[0]blah1
header[1]blah2
header[2]blah3
header[3]blah4
header[4]blah5
fluxion@purity:~/temp$
 
Dinh said:
Oh yes, that is a much better idea. But I have no idea what to use.
Click to expand...
I don't think the language really matters. Use whatever you know.


Here's a one-liner in perl that does it:
Code: 
> cat cities 
Pittsburgh
Atlanta
New York

> cat cities | perl -pe '$i or $i = 0; s/^/header[$i] /; $i++'
header[0] Pittsburgh
header[1] Atlanta
header[2] New York

If you need to format the numbers to two digits then it become slightly more complex.
 
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