box(){ t="$1xxxx";l="";c=${2:-=};i=${#t};until [ $i = 0 ]; do l="$l$c";i=$((i-1));done;printf "$l\n$c $1 $c\n$l\n"; }

# A slightly longer but more portable (& BSD-friendly) version of the bash box function in https://mastodon.social/@climagic/100792670341617316