Bash script to automate a secret santa name draw.

secret-santa.sh

#! /bin/bash

# Instructions:
# Create two files names 'emails' and 'names'.
# Add your friends!
# Run this script in a terminal: `./secret-santa.sh`

is_mixed () {
  while read -r a && read -r b <&3;
  do
    firstname=$(echo $b | awk '{print $1}')
    lastname=$(echo $b | awk '{print $2}')
    if $(echo $a | grep -i $firstname &> /dev/null);
    then
      return 1
    fi
    if $(echo $a | grep -i $lastname &> /dev/null);
    then
      return 1
    fi
  done < emails 3<names
  return 0
}

shuffle () {
  echo "Shuffling..."
  cat names | shuf -o names
  cat emails | shuf -o emails
}

shuffle
while ! is_mixed; do shuffle; done

while read -r a && read -r b <&3;
do

#echo -e "$a -> $b";
subject="Subject: Secret Santa \n\n"
name="${b//?/*}\n${b}\n${b//?/*}\n\n"
message=$(cat <<EOF
To add to this year's festivities, we have decided to do a secret santa!\n
Please find the name you have drawn below...\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
EOF
)
printf "${subject}${message}${name}" | ssmtp $a

done < emails 3<names