merging two files Post: 52920

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Top Forums Shell Programming and Scripting merging two files Post 52920 by Gary Dunn on Tuesday 29th of June 2004 05:35:27 PM

06-29-2004

Registered User

making things too hard

hello,

there are many ways to skin a cat. All good suggestions, however, the file cannot be sorted. One of the files will only have appended data , meaning the data is attached to the end of the file only. The other file will have data inserts that could appear all over the file. From the example given:

file1

this is mango
this is banana
this is apple
this is grape
this is pineapple
this is orange
this is watermelon

file2

this is mango
this is apple
this is orange
this is cherry
this is lemon

OUTPUT should be

this is mango
this is banana
this is apple
this is grape
this is pineapple
this is orange
this is watermelon
this is cherry
this is lemon

----------------------------------

the one solution given by appending the second file appears to be what you want. That is if this example holds true. The implementation needs a little going over.

If only one file, file1 will have modified data inserts all over its contents. This can be your primary file.
The second file does not really need to start off with any content since the only data modifications to be performed are to be done on the EOF. New data appended to back of file.
If you want to keep a copy of the original file then simply have three (3) files instead of two (2)

When the event happens that you merge these files say a specific time sceduled in cron or by size or what ever it is you simply take the 3rd files contents , which are the records originally appended to the back of the secondary file. ( which now is just a copy of the original file ) a 3rd file has the new records.
then simply append file2 to file1.

--------------------
original data
----
this is mango
this is apple
this is orange

--------------------
file 1 & file 2 look like

this is mango
this is apple
this is orange
-------------------------
file 3
null
-------------------------
file1 after inserts

this is mango
this is banana
this is apple
this is grape
this is pineapple
this is orange
this is watermelon

file2-----------------
simply a copy or dummy file showing appends
- don't really need except for archive purposes

this is mango
this is apple
this is orange
[this is cherry]
[this is lemon]

-------------------------------------
3rd / ( or 2nd ) file
this is cherry
this is lemon

OUTPUT file ( cat file2 >> file1 )

this is mango
this is banana
this is apple
this is grape
this is pineapple
this is orange
this is watermelon
this is cherry
this is lemon

Smilie

Gary Dunn

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LEARN ABOUT PHP

array_push

ARRAY_PUSH(3)								 1							     ARRAY_PUSH(3)

array_push - Push one or more elements onto the end of array

SYNOPSIS

       int array_push (array  &$array, mixed  $value1, [mixed  $...])

DESCRIPTION

       array_push(3)  treats $array as a stack, and pushes the passed variables onto the end of $array. The length of $array increases by the num-
       ber of variables pushed. Has the same effect as:

       <?php
       $array[] = $var;
       ?>

       Note

	       If you use array_push(3) to add one element to the array it's better to use $array[] =  because in that way there is no overhead of
	      calling a function.

       Note

	      array_push(3)  will  raise a warning if the first argument is not an array. This differs from the $var[] behaviour where a new array
	      is created.

PARAMETERS

	      o $array
		- The input array.

	      o $value1
		- The first value to push onto the end of the $array.

RETURN VALUES

	Returns the new number of elements in the array.

EXAMPLES

       Example #1

	      array_push(3) example

	      <?php
	      $stack = array("orange", "banana");
	      array_push($stack, "apple", "raspberry");
	      print_r($stack);
	      ?>

	      The above example will output:

	      Array
	      (
		  [0] => orange
		  [1] => banana
		  [2] => apple
		  [3] => raspberry
	      )

SEE ALSO

       array_pop(3), array_shift(3), array_unshift(3).

PHP Documentation Group 													     ARRAY_PUSH(3)

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array_push