why 
my $parallel_running_command = parallelize_bash_commands([@commands]);

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and not simplier and more efficient 
my $parallel_running_command = parallelize_bash_commands(\@commands);

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Here is same but simplier, thus more maintenable version of parallelize_bash_commands function: 
sub parallelize_bash_commands {
   return join '', map { "( ( $_ ) & );" } @$_;
}

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Why you checking for correctness of passed array ref into this sub? Let Perl do it.
Instead, you'll better check whether your passed commands contain "dangerous" characters like "(", "&", etc, which will break your sub in a much worse way!

In reply to Re: Using perl to speed up a series of bash commands by transforming them into a single command that will run everything in parallel. by vkon
in thread Using perl to speed up a series of bash commands by transforming them into a single command that will run everything in parallel. by tphyahoo

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