update_ssh_personal_environment() {
     if [ $# -gt 0 -a "$1" = "--debug" ] ; then
         export SSH_PERS_ENV_DEBUG=1
         shift
     fi
     if test -n "$SSH_PERS_ENV_FILES" -o "$#" -gt 0  ; then
         export SSH_PERS_ENV_FILES=$(
             eval echo $@ $SSH_PERS_ENV_FILES | \
                 tr " " "\n" | \
                 sort -u | \
                 tr "\n" " "
         ) # pattern expansion
         test "${SSH_PERS_ENV_DEBUG:-}" && \
             echo "Packing as SSH Personal Environment: $SSH_PERS_ENV_FILES" 1>&2
         export SSH_PERS_ENV_DATA=$(tar -C ~ -cz $SSH_PERS_ENV_FILES | base64)
     fi
 }