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How to replace a particular string in a line

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Operating Systems Linux Red Hat How to replace a particular string in a line
# 1  
Old 01-09-2009
Power How to replace a particular string in a line
I have a file with has the following data

abaddda;;;;;;;;asdfd;;;d;dadfewdff;f;v;v;v;;v;v;v;v;v;v;v;w;;
;frf;r;v;afd;f;ad;f;d;;va;;g;g;sd;a;dg;ag;ads;ga;dga;d;dsa;;;;
;;sd;df;asd;f;df;adf;adf;;df;df;;d;f;f;sf;df;f;df;;fd;f;f;sdfd;;;;


I want to replace every 13 th semicolon ; in everyline with two semicolons ;; , is this possible
# 2  
Old 01-09-2009
Should be something like:

Code:
awk -F";" '$13=$13";"' OFS=";" file

Regards
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