Diff the response from 2 or more URLs.

diff-urls.sh

#!/bin/bash
# Diff the JSON response from 2 or more URLs.

name=`basename $0`

if [ $# -lt 3 ]
then
  echo "Usage: $NAME <path> <host 1> <host 2> <...>" 1>&2
  echo "Example: $NAME /foo https://www.example.com https://www.google.com https://www.amazon.com" 1>&2
  exit 1
fi

path=$1
shift

index=0
diff_cmd="diff -wu --from-file"

for host in "$@"
do
    url="${host}${path}"
    file="/tmp/diff_urls.file.${index}"

    # cURL resource and sort JSON response
    curl_cmd="curl -s $url | jq -SM '.' > $file"
    echo "$curl_cmd" 1>&2
    bash -c "$curl_cmd"

    diff_cmd+=" $file"

    index=$((index+1))
done

# Diff all temp files.
echo "$diff_cmd"
bash -c "$diff_cmd"