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So this is the one that i tried and it works. Thanks kenosis and others for taking the time.
#!/usr/bin/perl use strict; use warnings; open FILE1,"input.txt"; open FILE2,">>output.txt"; foreach my $line ( <FILE1> ) { $_= $line; s/^HDR.{47}//; s/\KFTR.{27}//; print FILE2 $_; } close FILE1; close FILE2;
this made the most clarity for me. I am assuming that the entire file doesnt gets stored in the $_ in this approach, correct me if i am wrong. and the file is only getting read one line at a time. This i want to make sure so that it performs well when i actually test with the huge file.

In reply to Re^4: header footer by gupr1980
in thread header footer by gupr1980

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