I'm not familiar with the syntax of Postgresql, but I think you just need to do something like this. 
my $s2 = "\\copy (" ....

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Or what you can do is to print $s2 and see if the syntax is valid in Postgresql.

In reply to Re: Correct syntax for using \copy to import a file into a Postgres db by bichonfrise74
in thread Correct syntax for using \copy to import a file into a Postgres db by BruceDB

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