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Top Forums Shell Programming and Scripting How to extract first and last line of different record from a file Post 302282880 by Bungash125 on Monday 2nd of February 2009 05:38:21 AM
Old 02-02-2009
How to extract first and last line of different record from a file

Hi all

I want to inquire that is there any unix command that can help me while extracting first and last line in a file ( TEST.dat)
for example in the below record i want to extract the line that are in BOLD text or in other words i want to extract line no 1,3,4 and 7

aa 1 2 3
aa 2 3 4
aa 3 4 5
bb 1 2 3
bb 2 3 4
bb 3 4 5
bb 4 5 6


Please help me, quick response will be highly appericiated

Regards,
BungashSmilie
 

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TV_EXTRACTINFO_EN(1p)					User Contributed Perl Documentation				     TV_EXTRACTINFO_EN(1p)

NAME
tv_extractinfo_en - read English-language listings and extract info from programme descriptions. SYNOPSIS
tv_extractinfo_en [--help] [--output FILE] [FILE...] DESCRIPTION
Read XMLTV data and attempt to extract information from English-language programme descriptions, putting it into machine-readable form. For example the human-readable text '(repeat)' in a programme description might be replaced by the XML element <previously-shown>. --output FILE write to FILE rather than standard output This tool also attempts to split multipart programmes into their constituents, by looking for a description that seems to contain lots of times and titles. But this depends on the description following one particular style and is useful only for some listings sources (Ananova). If some text is marked with the 'lang' attribute as being some language other than English ('en'), it is ignored. SEE ALSO
xmltv(5). AUTHOR
Ed Avis, ed@membled.com BUGS
Trying to parse human-readable text is always error-prone, more so with the simple regexp-based approach used here. But because TV listing descriptions usually conform to one of a few set styles, tv_extractinfo_en does reasonably well. It is fairly conservative, trying to avoid false positives (extracting 'information' which isn't really there) even though this means some false negatives (failing to extract information and leaving it in the human-readable text). However, the leftover bits of text after extracting information may not form a meaningful English sentence, or the punctuation may be wrong. On the two listings sources currently supported by the XMLTV package, this program does a reasonably good job. But it has not been tested with every source of anglophone TV listings. perl v5.14.2 2011-05-07 TV_EXTRACTINFO_EN(1p)
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