09-16-2005
Techincally speaking you cannot escape going for a char by char parsing.
Even if it happens to be a in built function it has to do a search for "\n" character n times to go to n'th line.
For simplicity if you want to totally exclude some portions you can use some unix tools like sed, grep to filter the file contents and then do your stuff
rishi
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I wanted to add specific text to each row in a text file containing three rows. Example:
0 8 7 6 5 5
7 8 9 0 7 9
7 8 9 0 1 2
And I want to add a 21 at the beginning of the first row, and blank spaces at the beginning of the second two rows. To get this:
21 0 8 7 6 5 5
7 8... (4 Replies)
Discussion started by: hertingm
4 Replies
2. Shell Programming and Scripting
Given a text file, how do you add a line of text after a specific line number? I believe I would want to use "sed" but I am unsure of the syntax. Thank you.
Mike (5 Replies)
Discussion started by: msb65
5 Replies
3. Shell Programming and Scripting
this is utterly embarassing :(
after posting here i revisited my files and found that when i used "vi" instead of a gui based editor, i suddenly found that the indentations were in fact wrong :(
sorry about this :( (0 Replies)
Discussion started by: mocca
0 Replies
4. Shell Programming and Scripting
hello,
I have got the following problem that I am hoping someone can help with please.
1. I have got the following text file (below) , the columns data are
'Test Day', 'Board', 'Betting Number'.
TEXT FILE
============================================
1 3 02-01-27-28-29-30
0 1... (1 Reply)
Discussion started by: jermaine4ever
1 Replies
5. Shell Programming and Scripting
Hello,
I have a problem which is giving me headache for days, can some please help. Please see code and text fiel below. Please see text in red for the problem I am facing
# Program gets an input x from user
while read line ; do
echo... (4 Replies)
Discussion started by: jermaine4ever
4 Replies
6. Programming
Hi,
I have an output file which has more than 1,000,000,000 lines. I am accessing this file in another C++ program. Now while accessing the output file using cin, I want to jump, say, to the 5,000,000th line directly and start accessing data from there. Is this possible? Could someone please... (4 Replies)
Discussion started by: mugga
4 Replies
7. UNIX for Dummies Questions & Answers
Hi all, I have a script which uses a basic line to add text into another file e.g.
grep -i test * >> test.txt
Is there a way I can get the output of the grep to output to a specific line in the text.txt for example output above the line starting "Bottom line..." (6 Replies)
Discussion started by: JayC89
6 Replies
8. Linux
Hello! All,
Could you please tell me how to get a specific line number from a text file?
For example below,
ABC
DEF ---> Get this line number, return to an variable
GHI
My OS is Linux.
Thank you so much for your help in advance! (3 Replies)
Discussion started by: barryxian
3 Replies
9. Shell Programming and Scripting
I have a text file like this:
subject1:LecturerA:10
subject2:LecturerA:40
if I was given string in column 1 and 2 (which are subject 1 and LecturerA) , i need to update 3rd field of that line containing that given string , which is, number 10 need to be updated to 100 ,for example.
The... (6 Replies)
Discussion started by: bmtoan
6 Replies
10. Shell Programming and Scripting
Hi
This is my first post and I'm just a beginner. So please be nice to me.
I have a couple of html files where a pattern beginning with "http://www.site.com" and ending with "/resource.dat" is present on every 241st line. How do I extract this to a new text file?
I have tried sed -n 241,241p... (13 Replies)
Discussion started by: dejavo
13 Replies
REWIND(3) 1 REWIND(3)
rewind - Rewind the position of a file pointer
SYNOPSIS
bool rewind (resource $handle)
DESCRIPTION
Sets the file position indicator for $handle to the beginning of the file stream.
Note
If you have opened the file in append ("a" or "a+") mode, any data you write to the file will always be appended, regardless of the
file position.
PARAMETERS
o $handle
- The file pointer must be valid, and must point to a file successfully opened by fopen(3).
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
rewind(3) overwriting example
<?php
$handle = fopen('output.txt', 'r+');
fwrite($handle, 'Really long sentence.');
rewind($handle);
fwrite($handle, 'Foo');
rewind($handle);
echo fread($handle, filesize('output.txt'));
fclose($handle);
?>
The above example will output something similar to:
Foolly long sentence.
SEE ALSO
fread(3), fseek(3), ftell(3), fwrite(3).
PHP Documentation Group REWIND(3)