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Top Forums UNIX for Dummies Questions & Answers Delete rows with unique value for specific column Post 302654769 by A-V on Tuesday 12th of June 2012 09:31:00 AM
Old 06-12-2012
fortunately it doesn't do any anything on my file Smilie
so even putting into a file it returns an empty file

oooppsssss ... my mistake Smilie
I only put the file1 once
why we need to put it twice? is it for comparison?

Thanks for your help

---------- Post updated at 08:31 AM ---------- Previous update was at 08:16 AM ----------

i tested it on my documents

somehow, it does not delete all the single lines so I do steel have unique data
on the other hand it deletes one row from the non-unique ones as well so if i have two james on file one, in output i have 1 james only

any suggestion?

Last edited by A-V; 06-12-2012 at 10:23 AM..
 

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SPLIT(1)							   User Commands							  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 size is 1000 lines, and 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 generate suffixes of length N (default 2) --additional-suffix=SUFFIX append an additional SUFFIX to file names -b, --bytes=SIZE put SIZE bytes per output file -C, --line-bytes=SIZE put at most SIZE bytes of lines per output file -d, --numeric-suffixes[=FROM] use numeric suffixes instead of alphabetic; FROM changes the start value (default 0) -e, --elide-empty-files do not generate empty output files with '-n' --filter=COMMAND write to shell COMMAND; file name is $FILE -l, --lines=NUMBER put NUMBER lines per output file -n, --number=CHUNKS generate CHUNKS output files; see explanation below -u, --unbuffered immediately copy input to output with '-n r/...' --verbose print a diagnostic just before each output file is opened --help display this help and exit --version output version information and exit SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000). CHUNKS may be: N split into N files based on size of input K/N output Kth of N to stdout l/N split into N files without splitting lines l/K/N output Kth of N to stdout without splitting lines r/N like 'l' but use round robin distribution r/K/N like- wise but only output Kth of N to stdout GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report split translation bugs to <http://translationproject.org/team/> AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. 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 coreutils 'split invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 SPLIT(1)
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