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Top Forums Shell Programming and Scripting Help with replace character based on specific location Post 302503819 by perl_beginner on Friday 11th of March 2011 08:56:36 PM
Old 03-11-2011
Help with replace character based on specific location

Hi,

I got long list of reference file (column one is refer to the header in input file; column 2 is info of start position in input file; column 3 is info of end position in input fileSmilie shown as below:
Code:
read_2 10 15
read_3 5 8
read_1 4 10
.
.
.

Input file (huge file with total file size more than 1GB):
Code:
++read_1
AFSFAFHAKSJFHAKSJFHAKJSFHAFHASJKFHAS
++read_2
ASDFASJFOASUFRIEUIEWOUIEOWUIOEWUIEWFSFSJDHGJDSKHGSKDJHG
++read_3
UTWETEWTWETEWTEWTEF
.
.

Desired output:
Code:
++read_1
AFSXXXXXXXJFHAKSJFHAKJSFHAFHASJKFHAS
++read_2
ASDFASJFOXXXXXXEUIEWOUIEOWUIOEWUIEWFSFSJDHGJDSKHGSKDJHG
++read_3
UTWEXXXXWETEWTEWTEF
.
.

I would like to replace the character in input file with "X" based on the header description (colomn 1), start position to replace (column 2), end position to replace (column) in reference file.
My input file might be quite huge (>1GB)
Thanks for any advice.
 

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DB2_FIELD_WIDTH(3)							 1							DB2_FIELD_WIDTH(3)

db2_field_width - Returns the width of the current value of the indicated column in a result set

SYNOPSIS
int db2_field_width (resource $stmt, mixed $column) DESCRIPTION
Returns the width of the current value of the indicated column in a result set. This is the maximum width of the column for a fixed-length data type, or the actual width of the column for a variable-length data type. PARAMETERS
o $stmt - Specifies a statement resource containing a result set. o $column - Specifies the column in the result set. This can either be an integer representing the 0-indexed position of the column, or a string containing the name of the column. RETURN VALUES
Returns an integer containing the width of the specified character or binary data type column in a result set. If the specified column does not exist in the result set, db2_field_width(3) returns FALSE. SEE ALSO
db2_field_display_size(3), db2_field_name(3), db2_field_num(3), db2_field_precision(3), db2_field_scale(3), db2_field_type(3). PHP Documentation Group DB2_FIELD_WIDTH(3)
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