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Full Discussion: Cut text file in place
Top Forums Shell Programming and Scripting Cut text file in place Post 302833599 by Corona688 on Wednesday 17th of July 2013 12:26:38 PM
Old 07-17-2013
In general, 'in place' almost never is, because files do not work that way. You cannot tell a disk 'snip this line here, change that text there, and make it all line up properly'. You get to seek, overwrite, and truncate, and that's it.

And that is what you need to do here -- truncate. Figure out exactly what byte you need the file to stop at, seek to that point, then truncate the rest. What languages can you use? I'm not sure you can do this in pure shell.
 

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LEARN ABOUT DEBIAN

linux::distribution

Linux::Distribution(3pm)				User Contributed Perl Documentation				  Linux::Distribution(3pm)

NAME

       Linux::Distribution - Perl extension to detect on which Linux distribution we are running.

SYNOPSIS

	 use Linux::Distribution qw(distribution_name distribution_version);

	 if(my $distro = distribution_name) {
	       my $version = distribution_version();
	       print "you are running $distro, version $version
";
	 } else {
	       print "distribution unknown
";
	 }

	 Or else do it OO:

	 use Linux::Distribution qw(distribution_name distribution_version);

	 my $linux = Linux::Distribution->new;
	 if(my $distro = $linux->distribution_name()) {
	       my $version = $linux->distribution_version();
	       print "you are running $distro, version $version
";
	 } else {
	       print "distribution unknown
";
	 }

DESCRIPTION

       This is a simple module that tries to guess on what linux distribution we are running by looking for release's files in /etc.  It now looks
       for 'lsb-release' first as that should be the most correct and adds ubuntu support.  Secondly, it will look for the distro specific files.

       It currently recognizes slackware, debian, suse, fedora, redhat, turbolinux, yellowdog, knoppix, mandrake, conectiva, immunix, tinysofa,
       va-linux, trustix, adamantix, yoper, arch-linux, libranet, gentoo, ubuntu, scientific, oracle enterprise linux and redflag.

       It has function to get the version for debian, suse, fedora, redhat, gentoo, slackware, scientific, oracle enterprise linux, redflag and
       ubuntu(lsb). People running unsupported distro's are greatly encouraged to submit patches :-)

   EXPORT
       None by default.

TODO

       Add the capability of recognize the version of the distribution for all recognized distributions.

AUTHORS

       Alexandr Ciornii <alexchorny@gmail.com>, <http://chorny.net> Alberto Re, <alberto@accidia.net> Judith Lebzelter, <judith@osdl.org>

COPYRIGHT AND LICENSE

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.5 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2012-03-18						  Linux::Distribution(3pm)
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