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Top Forums Shell Programming and Scripting Differences between 2 Flat Files and process the differences Post 302438016 by newbie_8398 on Saturday 17th of July 2010 12:20:15 PM
Old 07-17-2010
Differences between 2 Flat Files and process the differences

Hi Guru
Thanks for the quick answer...Not well versed with awk so wanted to confirm my understanding...

basically when you say:
Code:
'NR==FNR{a[i++]=$1" "$2" "$3" "$4;next;}

you are taking the first file and putting all its data into array a[i]
so a[1] will have first row of the first file so you insert the whole data of the first file in a[i]

now when you say
Code:
{x=$1" "$2" "$3" "$4; for (j in a){if (a[j] == x)next;}}1'

this is the part where NR not equal to FNR ie you start reading the second file you assign X with the first row of the second file then you use the for loop to compare each row of first file with the row in the second file if its equal then you continue to the next row otherwise you put the entry into diff file .This you do for each row in the second file
Code:
i=1 j=1 file1 file2 > diff_file

this part you have initialized i,j


It will be great if you could confirm...It would be a great help


Thanks

Last edited by Scott; 07-17-2010 at 01:52 PM.. Reason: Code tags and formatting
 

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MSSQL_FETCH_ROW(3)														MSSQL_FETCH_ROW(3)

mssql_fetch_row - Get row as enumerated array

SYNOPSIS
array mssql_fetch_row (resource $result) DESCRIPTION
mssql_fetch_row(3) fetches one row of data from the result associated with the specified result identifier. The row is returned as an array. Each result column is stored in an array offset, starting at offset 0. Subsequent call to mssql_fetch_row(3) would return the next row in the result set, or FALSE if there are no more rows. PARAMETERS
o $result - The result resource that is being evaluated. This result comes from a call to mssql_query(3). RETURN VALUES
Returns an array that corresponds to the fetched row, or FALSE if there are no more rows. EXAMPLES
Example #1 mssql_fetch_row(3) example <?php // Connect to MSSQL and select the database $link = mssql_connect('MANGOSQLEXPRESS', 'sa', 'phpfi'); mssql_select_db('php', $link); // Query to execute $query = mssql_query('SELECT [id], [quote] FROM [quotes] WHERE [id] = '42'', $link); // Did the query fail? if (!$query) { die('MSSQL error: ' . mssql_get_last_message()); } // Fetch the row $row = mssql_fetch_row($query); // Print the 'quote' echo 'Quote #' . $row[0] . ': "' . $row[1] . '"'; ?> The above example will output something similar to: Quote #42: "The answer to everything..." NOTES
Note This function sets NULL fields to the PHP NULL value. SEE ALSO
mssql_fetch_array(3), mssql_fetch_object(3), mssql_data_seek(3), mssql_result(3). PHP Documentation Group MSSQL_FETCH_ROW(3)
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