perl can do all of this internally.
Why don't you show us a few lines of your input you're sending to these commands, your expected output after they're processed, and we'll see if we can avoid you shelling out?
Here's an attempt of what I think you want though:
use warnings;
use strict;
my @lines = (
# where '\t' is a real tab
"one\ttwo\tthree",
"four\tfive\tsix",
);
for my $line (@lines){
my $str = (split /\t/, $line)[0];
$str =~ s/.$//;
print "$str\n";
}
__END__
on
fou
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