How to share your current working directories with other terminals ...

share_dir.sh

PROMPT_COMMAND=__prompt_command

__prompt_command() {
	if [[ -f '/tmp/sdir' ]]; then
        local -r terminal_number=$(tty)
        local -r terminal_number_in_sdir_file=$(awk --field-separator '|' '{print $1}' /tmp/sdir)
        local -r dir_in_sdir_file=$(awk --field-separator '|' '{print $2}' '/tmp/sdir')
        if [[ "${terminal_number}" != "${terminal_number_in_sdir_file}" ]]; then
            \rm --force '/tmp/sdir'
            echo "Changing to: [${dir_in_sdir_file}] via 'sdir' file"
            cd "${dir_in_sdir_file}"
        fi
    fi
}

# You will also need this bash function:
sdir() {
    local -r terminal_number=$(tty)
    local -r current_dir=$(readlink --canonicalize-existing "${PWD}")
    echo "${terminal_number}|${current_dir}" > /tmp/sdir
}