Re: removing lines that are in the end of a file

The answers so far do not seem to have noticed the first line which also contains "SIL".

This is pretty trivial using File::ReadBackwards:

#! perl -slw
use strict;
use File::ReadBackwards;

my $file = $ARGV[ 0 ];

tie *BW, 'File::ReadBackwards', $file;

my $lastpos = -s( $file );
while( <BW> ) {
    last unless /SIL/;
    $lastpos = tell( BW )
}
truncate $file, $lastpos;
close BW;
[download]

A sample run:

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

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Re^2: removing lines that are in the end of a file by bhargavkanakiya (Initiate) on Apr 19, 2013 at 09:33 UTC
Thanks a lot to you. This also removes the last line with SIL. This is not how i wanted but still you have made my task a lot easier. I can add last SIL using other software that i am currently working on.	[reply]
Re^3: removing lines that are in the end of a file by BrowserUk (Patriarch) on Apr 19, 2013 at 12:46 UTC
This also removes the last line with SIL. This is not how i wanted ReadBackwards() has to do strange things with tell, so a little extra work is involved. Try this version: `#! perl -slw use strict; use File::ReadBackwards; my $file = $ARGV[ 0 ]; tie *BW, 'File::ReadBackwards', $file; my $lastpos = -s( $file ); my $len = 0; while( <BW> ) { $len = length() +1; next unless length >1; last unless /SIL/; $lastpos = tell( BW ); } truncate $file, $lastpos + $len; close BW;` [download] Note: You won't need the +1 in the `$len = length() +1;` line if you are not on Windows. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply] [d/l] [select]