bitcoin-last-block-age.sh

#!/usr/bin/env bash

set -e

COINCLIENT=bitcoin-cli

function displaytime {
  local T=$1
  local D=$((T/60/60/24))
  local H=$((T/60/60%24))
  local M=$((T/60%60))
  local S=$((T%60))
  [[ $D > 0 ]] && printf '%d days ' $D
  [[ $H > 0 ]] && printf '%d hours ' $H
  [[ $M > 0 ]] && printf '%d minutes ' $M
  [[ $D > 0 || $H > 0 || $M > 0 ]] && printf 'and '
  printf '%d seconds\n' $S
}

cnt=$($COINCLIENT getblockcount)
hash=$($COINCLIENT getblockhash ${cnt})
timeline=$($COINCLIENT getblock $hash | grep '"time"')

ltrimtime=${timeline#*time\" : }
newest=${ltrimtime%%,*}
secondsago=$(($(date +%s)-$newest))

echo "Last block was $(displaytime $secondsago) ago"