BASH Dump Flash Card Data from Quizlet

#!/bin/bash
######################################################################
#Copyright (C) 2025  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/>.
######################################################################

# Dump Flashcard data from Quizlet

useragent="user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36"

# fatal uses SIGUSR1 to allow clean fatal errors
trap "exit 1" 10
PROC=$$

function error() {
  red=$(echo -en "\e[31m")
  normal=$(echo -en "\e[0m")

  echo -e "${red}$@${normal}" >&2
  #  exit 1
  kill -10 $PROC
}

[[ $1 ]] || error "URL Needed"
[[ $1 =~ "http" ]] || error "Invalid URL $1"
url="$1"

dump="$(curl -s "$url" -H "$useragent")"
echo "$dump" |
  sed 's/</\n</g' |
  grep "<span" |
  grep TermText |
  sed -e 's/<[^>]*>//g' |
  recode html..ascii |
  sed 'N;s/\(.*\)\n\(.*\)/\1|\2/'