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As you only want permutations of only 2 values 
 
perl -MAlgorithm::Permute -lane 'push(@{$X},@F);END{ $p= new Algorithm::Permute($X,2);while(@w=$p-&gt;next){print @w} }'
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As you only want permutations of only 2 values

perl -MAlgorithm::Permute -lane 'push(@{$X},@F);END{ $p= new Algorithm::Permute($X,2);while(@w=$p->next){print @w} }'

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Hello, 
 
The following command produces permutations: 
perl -MAlgorithm::Permute -lane ' Algorithm::Permute::permute { print &quot;@F&quot; } @F' 
 
i.e. (input) 
test1 test2 
test3 test4 
 
i.e. (ouput) 
test1 test2 
test2 test1 
test3 test4 
test4 test3 
 
This does not produce all variants. Is there a way to adjust the script so it will produce all variants? 
 
output i'm looking for: 
 
test1 test2 
test2 test1 
test3 test1 
test3 test2 
test1 test3 
test2 test3 
 
etc
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Hello,

The following command produces permutations:
perl -MAlgorithm::Permute -lane ' Algorithm::Permute::permute { print "@F" } @F'

i.e. (input)
test1 test2
test3 test4

i.e. (ouput)
test1 test2
test2 test1
test3 test4
test4 test3

This does not produce all variants. Is there a way to adjust the script so it will produce all variants?

output i'm looking for:

test1 test2
test2 test1
test3 test1
test3 test2
test1 test3
test2 test3

etc

Permute Perl Help

Perl is a high-level, general-purpose, interpreted, dynamic programming languages with over 25 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large-scale development projects.  Perl gained widespread popularity as a Common Gateway Interface (CGI) scripting language, in part due to its regular expression and string parsing abilities. In addition to CGI, Perl is used for graphics programming, system administration, network programming, finance, bioinformatics, and other applications.