Fetch bitcoin value

#!/bin/bash
######################################################################
#Copyright (C) 2024  Kris Occhipinti
#https://filmsbykris.com

#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation version 3 of the License.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.
######################################################################

# this will get the current bitcoin value in USD
# Note that there is a limit of requests that can be made to the API
# so we will make sure we don't check more then once a minute

url="https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd"
bittime="/tmp/bittime.log"
bitvalue="/tmp/bitvalue.log"

normal=$(echo -en "\e[0m")
red=$(echo -en "\e[31m")
green=$(echo -en "\e[32m")

# Make sure it's been at least 60 seconds
currenttime="$(date +%s)"
lasttime=0
[[ -f $bittime ]] && lasttime="$(head -n 1 $bittime)"
timediff=$(( $currenttime - $lasttime ))
if [[ $timediff -lt 60 ]]
then
    #If it has been less then 60 seconds
    # show last value in red
    printf "${red}"
    cat $bitvalue
    exit
fi

#log current time to file
echo $currenttime > $bittime

# fetch and print current value in green
value="$(wget -qO- "$url"|jq '.bitcoin.usd')"
printf "$%'d\n" $value > $bitvalue
printf "${green}$%'d\n" $value