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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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SQLSRV_FETCH(3) 														   SQLSRV_FETCH(3)

sqlsrv_fetch - Makes the next row in a result set available for reading

SYNOPSIS
mixed sqlsrv_fetch (resource $stmt, [int $row], [int $offset]) DESCRIPTION
Makes the next row in a result set available for reading. Use sqlsrv_get_field(3) to read the fields of the row. PARAMETERS
o $stmt - A statement resource created by executing sqlsrv_query(3) or sqlsrv_execute(3). o $row - The row to be accessed. This parameter can only be used if the specified statement was prepared with a scrollable cursor. In that case, this parameter can take on one of the following values: oSQLSRV_SCROLL_NEXT oSQLSRV_SCROLL_PRIOR oSQLSRV_SCROLL_FIRST oSQLSRV_SCROLL_LAST oSQLSRV_SCROLL_ABSOLUTE oSQLSRV_SCROLL_RELATIVE o $offset - Specifies the row to be accessed if the row parameter is set to SQLSRV_SCROLL_ABSOLUTE or SQLSRV_SCROLL_RELATIVE. Note that the first row in a result set has index 0. RETURN VALUES
Returns TRUE if the next row of a result set was successfully retrieved, FALSE if an error occurs, and NULL if there are no more rows in the result set. EXAMPLES
Example #1 sqlsrv_fetch(3) example The following example demonstrates how to retrieve a row with sqlsrv_fetch(3) and get the row fields with sqlsrv_get_field(3). <?php $serverName = "serverNamesqlexpress"; $connectionInfo = array( "Database"=>"dbName", "UID"=>"username", "PWD"=>"password"); $conn = sqlsrv_connect( $serverName, $connectionInfo); if( $conn === false ) { die( print_r( sqlsrv_errors(), true)); } $sql = "SELECT Name, Comment FROM Table_1 WHERE ReviewID=1"; $stmt = sqlsrv_query( $conn, $sql); if( $stmt === false ) { die( print_r( sqlsrv_errors(), true)); } // Make the first (and in this case, only) row of the result set available for reading. if( sqlsrv_fetch( $stmt ) === false) { die( print_r( sqlsrv_errors(), true)); } // Get the row fields. Field indeces start at 0 and must be retrieved in order. // Retrieving row fields by name is not supported by sqlsrv_get_field. $name = sqlsrv_get_field( $stmt, 0); echo "$name: "; $comment = sqlsrv_get_field( $stmt, 1); echo $comment; ?> SEE ALSO
sqlsrv_get_field(3), sqlsrv_fetch_array(3), sqlsrv_fetch_object(3). PHP Documentation Group SQLSRV_FETCH(3)
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