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Homework and Emergencies Homework & Coursework Questions Sort function -- My First Unix Homework! Post 302454101 by methyl on Friday 17th of September 2010 07:37:45 AM
Old 09-17-2010
I can't see a suitable "sort" command.
The output file is every line starting with "+1" in the order read followed by every line starting with "-1" in the order read.

One simple way to achive the output is to read the file twice, outputting first the "+1" records then the "-1" records.
Code:
for prefix in "+1" "-1"
do
        cat dummy.txt | while read line
        do
                case "${line}" in
                        "${prefix}"*)
                                echo "${line}"
                                ;;
                esac
        done
done

./scriptname
+1 1:2     2:4      4:3.2
+1 1:-6    2:-4    4:2.2
+1 1:2.98  2:5.6   4:8.1
-1 2:2.1   2:2.1   6:5.9
-1 1:9.6   2:6.3   6:5.8
-1 3:0.3   3:0.3   5:4.1


Last edited by methyl; 09-17-2010 at 08:40 AM.. Reason: correct input filename.
 

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Cz::Sort(3pm)						User Contributed Perl Documentation					     Cz::Sort(3pm)

NAME
Cz::Sort - Czech sort SYNOPSIS
use Cz::Sort; my $result = czcmp("_x j&a", "_&p"); my @sorted = czsort qw(plachta plaoka Planieka planieka plani); print "@sorted "; DESCRIPTION
Implements czech sorting conventions, indepentent on current locales in effect, which are often bad. Does the four-pass sort. The idea and the base of the conversion table comes from Petr Olsak's program csr and the code is as compliant with CSN 97 6030 as possible. The basic function provided by this module, is czcmp. If compares two scalars and returns the (-1, 0, 1) result. The function can be called directly, like my $result = czcmp("_x j&a", "_&p"); But for convenience and also because of compatibility with older versions, there is a function czsort. It works on list of strings and returns that list, hmm, sorted. The function is defined simply like sub czsort { sort { czcmp($a, $b); } @_; } standard use of user's function in sort. Hashes would be simply sorted @sorted = sort { czcmp($hash{$a}, $hash{$b}) } keys %hash; Both czcmp and czsort are exported into caller's namespace by default, as well as cscmp and cssort that are just aliases. This module comes with encoding table prepared for ISO-8859-2 (Latin-2) encoding. If your data come in different one, you might want to check the module Cstocs which can be used for reencoding of the list's data prior to calling czsort, or reencode this module to fit your needs. VERSION
0.68 SEE ALSO
perl(1), Cz::Cstocs(3). AUTHOR
(c) 1997--2000 Jan Pazdziora <adelton@fi.muni.cz>, http://www.fi.muni.cz/~adelton/ at Faculty of Informatics, Masaryk University, Brno perl v5.10.1 2000-05-16 Cz::Sort(3pm)
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