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Full Discussion: Awk command to replace specific position characters.
Top Forums Shell Programming and Scripting Awk command to replace specific position characters. Post 302594687 by mirni on Wednesday 1st of February 2012 03:17:35 AM
Old 02-01-2012
Quote:
sprintf("%-*s", t-f+1, v) --> here "s" represents the entire line
No, 's' in the format stands for "string". It tells sprintf that the argument to be printed is a string (as opposed to %d which would expect a decimal number or %f which would expect a float).
Code:
var="MyString"
sprintf("%s", var)  #will print "MyString"

So
Code:
 sprintf("%-*s", t-f+1, v)

is printing the string stored in variable v, with the format "%-*s", t-f+1 telling sprintf to justify left (-) and pad with (t-f+1) spaces.

Space concatenates strings in awk. So
Code:
a="one" "two"

will produce "onetwo"
Code:
a=b c  #concat of variables
a = $1 $2 #concats first and second field

 

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LEARN ABOUT PHP

pg_field_size

PG_FIELD_SIZE(3)														  PG_FIELD_SIZE(3)

pg_field_size - Returns the internal storage size of the named field

SYNOPSIS

       int pg_field_size (resource  $result, int  $field_number)

DESCRIPTION

       pg_field_size(3) returns the internal storage size (in bytes) of the field number in the given PostgreSQL $result.

       Note

	       This function used to be called pg_fieldsize(3).

PARAMETERS

	      o $result
		- PostgreSQL query result resource, returned by pg_query(3), pg_query_params(3) or pg_execute(3) (among others).

	      o $field_number
		- Field number, starting from 0.

RETURN VALUES

	The internal field storage size (in bytes). -1 indicates a variable length field.  FALSE is returned on error.

EXAMPLES

       Example #1

	      Getting information about fields

	      <?php
		$dbconn = pg_connect("dbname=publisher") or die("Could not connect");

		$res = pg_query($dbconn, "select * from authors where author = 'Orwell'");
		$i = pg_num_fields($res);
		for ($j = 0; $j < $i; $j++) {
		    echo "column $j
";
		    $fieldname = pg_field_name($res, $j);
		    echo "fieldname: $fieldname
";
		    echo "printed length: " . pg_field_prtlen($res, $fieldname) . " characters
";
		    echo "storage length: " . pg_field_size($res, $j) . " bytes
";
		    echo "field type: " . pg_field_type($res, $j) . " 

";
		}
	      ?>

	      The above example will output:

	      column 0
	      fieldname: author
	      printed length: 6 characters
	      storage length: -1 bytes
	      field type: varchar

	      column 1
	      fieldname: year
	      printed length: 4 characters
	      storage length: 2 bytes
	      field type: int2

	      column 2
	      fieldname: title
	      printed length: 24 characters
	      storage length: -1 bytes
	      field type: varchar

SEE ALSO

       pg_field_prtlen(3), pg_field_type(3).

PHP Documentation Group 													  PG_FIELD_SIZE(3)
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