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Top Forums Shell Programming and Scripting Overwrite & Delete in Text File Post 302131842 by 33junaid on Tuesday 14th of August 2007 03:01:32 AM
Old 08-14-2007
Overwrite & Delete in Text File

Dear All,

I have text file like this:

Header
Record 1
Record 2
.......
Record n
Tail

This line of code :
awk '{ if ( NR == 1 ) { head=substr($0,1,300);} else { last = substr($0,1,300);}END{printf "Header is : %-300s Trailer is : %-300s\n", head, last}' filename

converted Header and Trailer in one line and within 300 character each.The output is just one line.

Now I want to overwrite this one line above (Header+ Tail) over the first line of original file (orginal header) and delete the Tail........i can copy this header and tail to new file and then append Record 1 to Record n to this new file, but that will cause too low performance........so I think better to update first and the last line of the this file.................so how can i do that?

i.e. 1-update the header with new line i.e. (header+trailer)
2-delete the tail in original file (may be using cut tail -1 filename?)
 

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Email::Simple::Header(3pm)				User Contributed Perl Documentation				Email::Simple::Header(3pm)

NAME
Email::Simple::Header - the header of an Email::Simple message SYNOPSIS
my $email = Email::Simple->new($text); my $header = $email->head; print $header->as_string; DESCRIPTION
This method implements the headers of an Email::Simple object. It is a very minimal interface, and is mostly for private consumption at the moment. METHODS
new my $header = Email::Simple::Header->new($head, \%arg); $head is a string containing a valid email header, or a reference to such a string. If a reference is passed in, don't expect that it won't be altered. Valid arguments are: crlf - the header's newline; defaults to CRLF as_string my $string = $header->as_string(\%arg); This returns a stringified version of the header. header_names This method returns the unique header names found in this header, in no particular order. header_pairs This method returns all the field/value pairs in the header, in the order that they appear in the header. header my $first_value = $header->header($field); my @all_values = $header->header($field); This method returns the value or values of the given header field. If the named field does not appear in the header, this method returns false. header_set $header->header_set($field => @values); This method updates the value of the given header. Existing headers have their values set in place. Additional headers are added at the end. If no values are given to set, the header will be removed from to the message entirely. crlf This method returns the newline string used in the header. PERL EMAIL PROJECT
This module is maintained by the Perl Email Project <http://emailproject.perl.org/> COPYRIGHT AND LICENSE
Copyright 2006-2007 by Ricardo SIGNES Copyright 2004 by Casey West Copyright 2003 by Simon Cozens This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2011-12-23 Email::Simple::Header(3pm)
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