Bash script for Yahoo Finance historical data. Works with new cookie-based authentication

pullYahoo.sh

#!/bin/bash -eu                                                                                                       
                                                                                                                      
# Client script to pull Yahoo Finance historical data, off of its new cookie                                          
# authenticated site. Start/End Date args can be any GNU readable dates.                                              
# Script requires: GNU date, curl and bash shell                                                                      
                                                                                                                      
symbol=$1                                                                                                             
startDate=$2                                                                                                          
endDate=$3                                                                                                            
                                                                                                                      
startEpoch=$(date -d "$startDate" '+%s')                                                                              
endEpoch=$(date -d "$endDate" '+%s')                                                                                  
                                                                                                                      
cookieJar=$(mktemp)                                                                                                   
function cleanup() {                                                                                                  
    rm $cookieJar                                                                                                     
}                                                                                                                     
trap cleanup EXIT                                                                                                     
                                                                                                                      
function parseCrumb() {                                                                                               
    sed 's+}+\n+g' \                                                                                                  
»       | grep CrumbStore \                                                                                           
»       | cut -d ":" -f 3 \                                                                                           
»       | sed 's+"++g'                                                                                                
}                                                                                                                     
                                                                                                                      
function extractCrumb() {                                                                                             
    crumbUrl="https://ca.finance.yahoo.com/quote/$symbol/history?p=$symbol"                                           
    curl -s --cookie-jar $cookieJar $crumbUrl \                                                                       
»        | parseCrumb                                                                                                 
}                                                                                                                     
                                                                                                                      
crumb=$(extractCrumb)                                                                                                 
                                                                                                                      
baseUrl="https://query1.finance.yahoo.com/v7/finance/download/"                                                       
args="$symbol?period1=$startEpoch&period2=$endEpoch&interval=1d&events=history"                                       
crumbArg="&crumb=$crumb"                                                                                              
sheetUrl="$baseUrl$args$crumbArg"                                                                                     
                                                                                                                      
curl -s --cookie $cookieJar "$sheetUrl"