#!/bin/bash
var1=$(echo)
var2="TффффTфффффTфTффTTTфффTфффTфTф_$(date -Is)"
var3="$(cat input.tsv)"
# This one is just needed to visualize the error,
# using `set -x` shows that var3 already contains the incorrect data
echo "$var3" | iconv -f utf8 > /dev/null