Your program compiles, runs and produces this output: 

[perl 508]$ perl 498665.pl 
StID,SchooldID,TeacherID,KnowPre,KnowPost,Prefact
2,234,1001,,,
3,234,1001,,,
4,234,1001,,,
5,234,1001,,,
10,234,1001,,,
11,234,1001,,,
12,234,1001,,,
13,234,1001,,,
14,234,1001,,,
15,234,1001,,,
2..5,10..15,234,1001,,,

[download]

And your question is .... ?

In reply to Re: Iterate string like, for(1..5) i.e. $stirng="1..5"; for($string) by jkeenan1
in thread Iterate string like, for(1..5) i.e. $stirng="1..5"; for($string) by gman

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