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Top Forums Shell Programming and Scripting insert a header in a huge data file without using an intermediate file Post 302286265 by jim mcnamara on Tuesday 10th of February 2009 03:51:42 PM
Old 02-10-2009
There are 'edit in place' features for GNU sed and for perl (perl -pie ' perl script here').
However they do use tmp files behind the scenes
 

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MATCHERRC2PERLFILTER.PL(1)				User Contributed Perl Documentation				MATCHERRC2PERLFILTER.PL(1)

NAME
matcherrc2perlfilter -- Conversion of matcherrc rules to perl DESCRIPTION
This script converts matcherrc filtering rules into perl_filter rules for usage with the claws-mail-perl-filter plugin of the Claws Mail mailer. USAGE
matcherrc2perlfilter No arguments required. Conversion is done for current user only. FILES
$HOME/.claws-mail/matcherrc Input file where standard filtering rules lie. $HOME/.claws-mail/perl_filter Output file written by this script. Converted rules are appended if the file already exists, so be careful when running the script more than once. BUGS
This conversion script doesn't produce nice Perl code and is just intended to get you started. If you choose to use the Perl plugin, consider rewriting your rules. SEE ALSO
claws-mail-perl-filter(1), claws-mail(1) AUTHOR
This manual page was written by Ricardo Mones <mones@debian.org>, for the Debian GNU/Linux system (but may be used by others). The matcherrc2perlfilter was written by Holger Berndt <berndth@gmx.de>. perl v5.14.2 2012-11-17 MATCHERRC2PERLFILTER.PL(1)
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