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Top Forums UNIX for Dummies Questions & Answers Turning to SED to select specific records Post 302662629 by gjackson123 on Tuesday 26th of June 2012 11:51:11 PM
Old 06-27-2012
The Negation of union SED does not work

SmilieHi,

Code:
 
$ awk -F\| '{print $NF}' employee1.txt | sed -n 'N;N;N;/\nSmith\n.*\n.*$/p;/\nJones\n.*\n.*$/p'
Jessica
Smith
16/09/2000
Female
Kyle
Jones
02/10/1945
Male


The negation of Smith only works as follows:

Code:
 
$ awk -F\| '{print $NF}' employee1.txt | sed -n 'N;N;N;/\nSmith\n.*\n.*$/p'
John
Barry
21/04/1988
Male
Joyce
Brown
05/12/1985
Female
Kyle
Jones
02/10/1945
Male


However, applying the same negation "!" to the same union of SED statement recommended generated duplicate number of records for each every records in the file:

Code:
 
$ awk -F\| '{print $NF}' employee1.txt | sed -n 'N;N;N;/\nSmith\n.*\n.*$/!p;/\nJones\n.*\n.*$/!p'
John
Barry
21/04/1988
Male
John
Barry
21/04/1988
Male
Jessica
Smith
16/09/2000
Female
Joyce
Brown
05/12/1985
Female
Joyce
Brown
05/12/1985
Female
Kyle
Jones
02/10/1945
Male


What is the reason for this & what is the correct syntax for it?

Thanks a lot again,

George

 

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SPLIT(1)								FSF								  SPLIT(1)

NAME
split - split a file into pieces SYNOPSIS
split [OPTION] [INPUT [PREFIX]] DESCRIPTION
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default PREFIX is `x'. With no INPUT, or when INPUT is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -a, --suffix-length=N use suffixes of length N (default 2) -b, --bytes=SIZE put SIZE bytes per output file -C, --line-bytes=SIZE put at most SIZE bytes of lines per output file -l, --lines=NUMBER put NUMBER lines per output file --verbose print a diagnostic to standard error just before each output file is opened --help display this help and exit --version output version information and exit SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg. AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for split is maintained as a Texinfo manual. If the info and split programs are properly installed at your site, the command info split should give you access to the complete manual. split (coreutils) 4.5.3 February 2003 SPLIT(1)
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