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Top Forums Shell Programming and Scripting Deleting all the fields(columns) from a .csv file if all rows in that columns are blanks Post 302765959 by pamu on Monday 4th of February 2013 01:47:17 AM
Old 02-04-2013
Try sth like this.

Code:
 
$awk -F "," 'NR==FNR{for(i=1;i<=NF;i++){if($i == ""){X[i]++;}};x=NR;next}{for(i=1;i<=NF;i++){if(X[i] != (x-1)){s=s?s","$i:$i}}print s;s=""}' file file
 
Key, Data1,Data2,Data3,Data4
A,5,6,,10
A,3,4,,3
B,1,,4,5
B,2,,3,4


Last edited by pamu; 02-04-2013 at 05:04 AM.. Reason: Corrected..
 

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PDOSTATEMENT.BINDVALUE(3)						 1						 PDOSTATEMENT.BINDVALUE(3)

PDOStatement::bindValue - Binds a value to a parameter

SYNOPSIS
public bool PDOStatement::bindValue (mixed $parameter, mixed $value, [int $data_type = PDO::PARAM_STR]) DESCRIPTION
Binds a value to a corresponding named or question mark placeholder in the SQL statement that was used to prepare the statement. PARAMETERS
o $parameter - Parameter identifier. For a prepared statement using named placeholders, this will be a parameter name of the form $:name. For a prepared statement using question mark placeholders, this will be the 1-indexed position of the parameter. o $value - The value to bind to the parameter. o $data_type - Explicit data type for the parameter using the PDO::PARAM_* constants. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Execute a prepared statement with named placeholders <?php /* Execute a prepared statement by binding PHP variables */ $calories = 150; $colour = 'red'; $sth = $dbh->prepare('SELECT name, colour, calories FROM fruit WHERE calories < :calories AND colour = :colour'); $sth->bindValue(':calories', $calories, PDO::PARAM_INT); $sth->bindValue(':colour', $colour, PDO::PARAM_STR); $sth->execute(); ?> Example #2 Execute a prepared statement with question mark placeholders <?php /* Execute a prepared statement by binding PHP variables */ $calories = 150; $colour = 'red'; $sth = $dbh->prepare('SELECT name, colour, calories FROM fruit WHERE calories < ? AND colour = ?'); $sth->bindValue(1, $calories, PDO::PARAM_INT); $sth->bindValue(2, $colour, PDO::PARAM_STR); $sth->execute(); ?> SEE ALSO
PDO.prepare(3), PDOStatement.execute(3), PDOStatement.bindParam(3). PHP Documentation Group PDOSTATEMENT.BINDVALUE(3)
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