Discover pwd passwords

pwd-password.sh

#!/usr/bin/env bash

set -eu

if [ $# -ne 1 ]; then
  echo "Usage: $0 <password>"
  exit 1
fi

if command -v curl > /dev/null 2>&1 ; then
  echo "curl is installed"
  # curl --version
else
  echo "curl not found! Please install curl and run again!"
  exit
fi

if command -v awk > /dev/null 2>&1 ; then
  echo "awk is installed"
  # awk --version
else
  echo "awk not found! Please install awk and run again!"
  exit
fi

if command -v sha1sum > /dev/null 2>&1 ; then
  echo "sha1sum is installed"
  # sha1sum --version
else
  echo "sha1sum not found! Please install sha1sum and run again!"
  exit
fi

if command -v grep > /dev/null 2>&1 ; then
  echo "grep is installed"
  # grep --version
else
  echo "grep not found! Please install grep and run again!"
  exit
fi

password="$1"
if [ -z "$password" ]; then
  echo "Password cannot be empty."
  exit 1
fi

sha1=$(echo -n "$password" | sha1sum | awk '{print $1}')
prefix="${sha1:0:5}"

URL="https://api.pwnedpasswords.com/range/$prefix"
echo "Checking pwd password at ${URL}"
response=$(curl -s "https://api.pwnedpasswords.com/range/$prefix")

suffix="${sha1:5}"
match_line=$(echo "$response" | grep -i "$suffix")
if [ -n "$match_line" ]; then
  echo "Password has been leaked. Matching line:"
  echo "$match_line"
else
  echo "Password is secure."
fi