Correct horse battery staple: creates a password of english words. First param is number of words to use (default=3)

create-password.sh

TEMPDIR="$(mktemp -d)"
NR_WORDS=${1:-3}
cd "$TEMPDIR"
curl 'https://raw.githubusercontent.com/first20hours/google-10000-english/master/google-10000-english.txt' | grep -E "^.{4,8}$" | sort | uniq > wordlist.txt
NR_LINES="$(wc -l wordlist.txt | grep -oe '\d\+')"
POSS="$(echo "$NR_LINES^$NR_WORDS" | bc)"
BITS="$(echo "l($POSS)/l(2)" | bc -l)"
CHARS="$(echo "l($POSS)/l(72)" | bc -l)"
printf 'We have %d lines; we willl take %d words; there are %.3e possibilities (%.1f bits of entropy, comparable to %.1f completely random chars (lower/upper/number/special))\n' "$NR_LINES" "$NR_WORDS" "$POSS" "$BITS" "$CHARS"
if [[ $NR_LINES -lt "4000" ]]; then
    echo "WARNING: LIST OF WORDS IS TOO SMALL; continue at own risk"
fi
cat wordlist.txt | shuf -n $NR_WORDS | tr '\n' - | rev | cut -c 2- | rev