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my $html = `echo $plaintext | txt2html --extract`;
# -- or --
my $html = qx(echo $plaintext | txt2html --extract);
# where the ()s can be any seperator you can use on qw(), etc.

use IPC::Open2;

...
my $html = do { local $/; <$read_fh> };
# or you can use a while(<$read_fh>) { ... } loop.
waitpid $pid, 0; # don't leave "zombies"