conv.sh

#!/bin/bash
# coding: utf-8

function compress_hash()
{
  echo $2 | sed \
    -e 's/aaa*/A/g' \
    -e 's/abb*/B/g' \
    -e 's/acc*/C/g' \
    -e 's/add*/D/g' \
    -e 's/aee*/E/g' \
    -e 's/aff*/F/g' \
    -e 's/baa*/G/g' -e 's/ecc*/g/g' \
    -e 's/bbb*/H/g' -e 's/edd*/h/g' \
    -e 's/bcc*/I/g' -e 's/eee*/i/g' \
    -e 's/bdd*/J/g' -e 's/eff*/j/g' \
    -e 's/bee*/K/g' -e 's/faa*/k/g' \
    -e 's/bff*/L/g' -e 's/fbb*/l/g' \
    -e 's/caa*/N/g' -e 's/fcc*/n/g' \
    -e 's/cbb*/M/g' -e 's/fdd*/m/g' \
    -e 's/ccc*/O/g' -e 's/fee*/o/g' \
    -e 's/cdd*/P/g' -e 's/fff*/p/g' \
    -e 's/cee*/Q/g' -e 's/0[0-9][0-9]*/q/g' \
    -e 's/cff*/R/g' -e 's/1[0-9][0-9]*/r/g' \
    -e 's/daa*/S/g' -e 's/2[0-9][0-9]*/s/g' \
    -e 's/dbb*/T/g' -e 's/3[0-9][0-9]*/t/g' \
    -e 's/dcc*/U/g' -e 's/4[0-9][0-9]*/u/g' \
    -e 's/ddd*/V/g' -e 's/5[0-9][0-9]*/v/g' \
    -e 's/dee*/W/g' -e 's/6[0-9][0-9]*/w/g' \
    -e 's/dff*/X/g' -e 's/7[0-9][0-9]*/x/g' \
    -e 's/eaa*/Y/g' -e 's/8[0-9][0-9]*/y/g' \
    -e 's/ebb*/Z/g' -e 's/9[0-9][0-9]*/z/g' \
    | cut -c -$1
}

for hashstr in $@
do
  compress_hash 6 $hashstr
done

test.sh

while :
do
  hash=$(date +%s | md5sum | cut -f 1 -d ' ')
  compress_hash 6 $hash
  sleep 1
done