Need a quick and dirty solution Post: 302664065

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Top Forums Shell Programming and Scripting Need a quick and dirty solution Post 302664065 by drl on Thursday 28th of June 2012 09:51:39 PM

06-28-2012

Registered User

Hi.

Using available (but non-standard) utility msort:

Code:

#!/usr/bin/env bash

# @(#) s1	Demonstrate msort hybrid sort.
# See: http://freecode.com/projects/msort

pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C msort awk

FILE=${1-data1}
pl " Input data $FILE:"
cat $FILE

pl " Results:"
msort -q -l -n 2,2 -I -c hybrid $FILE |
tee f1 |
awk '!a[$1]++'

exit 0

producing:

Code:

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
bash GNU bash 3.2.39
msort 8.44
awk GNU Awk 3.1.5

-----
 Input data data1:
d v4.0.9
d v4.0.10
a v1.0
a v1.1
a v1.2
b v2.1
b v2.2
b v2.21
b v3.0
c v3.10
c v3.9

-----
 Results:
d v4.0.10
c v3.10
b v3.0
a v1.2

The intermediate results are on file f1. The awk prints the first occurrence of an item, skipping the rest.

If msort is not in your repository, see link in script for binary or source to compile.

Best wishes ... cheers, drl

drl

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tee

TEE(1)								   User Commands							    TEE(1)

NAME

       tee - read from standard input and write to standard output and files

SYNOPSIS

       tee [OPTION]... [FILE]...

DESCRIPTION

       Copy standard input to each FILE, and also to standard output.

       -a, --append
	      append to the given FILEs, do not overwrite

       -i, --ignore-interrupts
	      ignore interrupt signals

       --help display this help and exit

       --version
	      output version information and exit

       If a FILE is -, copy again to standard output.

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report tee translation bugs to <http://translationproject.org/team/>

AUTHOR

       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

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 tee is maintained as a Texinfo manual.  If the info and tee programs are properly installed at your site, the
       command

	      info coreutils 'tee invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								    TEE(1)