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Full Discussion: How to generate the list?
Top Forums Shell Programming and Scripting How to generate the list? Post 302408368 by drl on Monday 29th of March 2010 09:47:20 AM
Old 03-29-2010
Hi.

With a handy perl module:
Code:
#!/usr/bin/perl

# @(#) p2	Demonstrate combinations of strings.

use Math::Combinatorics;
use strict;
use warnings;

my @n = qw(e x p e c t);
print "combinations of 2 from: " . join( " ", @n ) . "\n";
print join( "\n", map { join " ", @$_ } combine( 2, @n ) ), "\n";
print "\n";

print "combinations of 2 from (non-replicated): " . join( " ", @n ) . "\n";
my (%hash) = map { $_, $_ } @n;
print join( "\n", map { join " ", @$_ } combine( 2, sort( keys(%hash) ) ) ),
  "\n";
print "\n";

producing:
Code:
% ./p2
combinations of 2 from: e x p e c t
e x
e p
e e
e c
e t
x p
x e
x c
x t
p e
p c
p t
e c
e t
c t

combinations of 2 from (non-replicated): e x p e c t
c e
c p
c x
c t
e p
e x
e t
p x
p t
x t

cheers, drl
 

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join(1T)						       Tcl Built-In Commands							  join(1T)

__________________________________________________________________________________________________________________________________________________

NAME
join - Create a string by joining together list elements SYNOPSIS
join list ?joinString? _________________________________________________________________ DESCRIPTION
The list argument must be a valid Tcl list. This command returns the string formed by joining all of the elements of list together with joinString separating each adjacent pair of elements. The joinString argument defaults to a space character. EXAMPLES
Making a comma-separated list: set data {1 2 3 4 5} join $data ", " => 1, 2, 3, 4, 5 Using join to flatten a list by a single level: set data {1 {2 3} 4 {5 {6 7} 8}} join $data => 1 2 3 4 5 {6 7} 8 SEE ALSO
list(1T), lappend(1T), split(1T) KEYWORDS
element, join, list, separator ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTcl | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tcl is available on http://opensolaris.org. Tcl join(1T)
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