#!/bin/sh
pwd
exit 0
parts="$(
for d in $(pwd); do
    [ -z "$d" ] && continue
    IFS=
    echo "$d" | head -c3
    echo
done
)"

printf '%s' $(
IFS=/
parts="$(
for d in $(pwd); do
    [ -z "$d" ] && continue
    IFS=
    echo "$d" | head -c3
    echo
done
)"
len="$(echo "$parts" | wc -l)"
[ $len -gt 3 ] && {
  printf '/'
  echo "$parts" | tail -r | tail -n+4 | tail -r | paste -sd'/' -
}

printf '/'
IFS=/
for d in $(pwd); do
    [ -z "$d" ] && continue
    IFS=
    echo "$d"
done | tail -n3 | paste -sd'/' -
)