[Script] Rectangulo con relleno

#! /bin/bash
#
c1="\xe2\x95\x94"
c2="\xe2\x95\x97"
c3="\xe2\x95\x9a"
c4="\xe2\x95\x9d"

lado="\xe2\x95\x91"
altura="10"
largo="50"
l="\xe2\x95\x90"
linea=$(printf "$l%.0s" `seq 1 $largo`)

Relleno="_"
relleno=$( printf "${Relleno}%.0s" $(seq  $largo) )

echo -e "${c1}${linea}${c2}"
printf "${lado}${relleno}${lado}%.0s\n" $(seq $altura)
echo -e "${c3}${linea}${c4}"